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SEO Diagrams: The Six Different Things People Mean

Updated September 2026 · Written and maintained by the Progression Agency strategy team

“SEO diagram” covers about six unrelated drawings that share a name — a crawl-index-rank flow, a site architecture tree, an internal link map, a topic cluster, a URL structure and a redirect map. This page separates them, explains what each is for and when you need it, and sets out what to actually look for in the three that most affect whether a site performs.

The short answerMost explanations of SEO jump straight to ranking factors, which skips where real problems occur. A page that is not discovered, not crawlable, or not indexed cannot rank at all — and no amount of optimization changes that.

Progression Agency is based in New York City and works with clients across the United States. The click-depth and structural guidance here reflects conventional practice rather than a published measurement. Updated September 2026.

Six diagrams called "SEO diagram"
People searching for one of these rarely want the others — which is why the results for the phrase are so scattered.

What is an SEO diagram?

Any drawing used to explain how search works or how a site is organized. In practice the phrase covers about six different things, and people arrive looking for whichever one their problem needs.

That ambiguity is the reason a search for it returns such a scattered set of images. Someone planning a site wants a site architecture diagram; someone explaining ranking to a client wants a crawl-index-rank flow; someone auditing links wants an internal link map. They are unrelated drawings sharing a name.

The six things people mean by “SEO diagram”
DiagramWhat it showsWhen you need it
Crawl, index, rank flowHow a page gets into resultsExplaining SEO to non-specialists
Site architecturePage hierarchy and depthPlanning or restructuring a site
Internal link mapWhich pages link to whichAuditing link equity distribution
Topic clusterA pillar page and its supporting pagesPlanning content
URL structure treeFolder and slug designBefore a build or migration
Redirect mapOld URL to new URLAny migration, without exception

Only two of these are diagrams you draw once and keep. The architecture and cluster maps are living documents; the redirect map is a working file that matters intensely for about two weeks and then becomes a record.

Crawl, index, rank — and where pages drop out
Optimization only operates at stage five. Most failures happen at stages one to four.

What does the crawl-index-rank diagram actually show?

Four stages: discovery, crawling, indexing, and ranking. Its value is that it makes visible the three places where a page can silently drop out before it ever competes.

Most explanations of SEO jump straight to ranking factors, which skips the part that causes the majority of real problems. A page that is not discovered, not crawlable, or not indexed cannot rank at all, and no amount of optimization changes that.

Discovery

The engine learns the URL exists — from a link, a sitemap, or a redirect. A page with no internal links and no sitemap entry may never be found.

Crawling

The engine fetches the page. Blocked by robots.txt, server errors, or being buried too deep to be worth reaching.

Rendering

Increasingly its own stage. Content that only appears after JavaScript runs may or may not be seen, depending on the render budget.

Indexing

The engine decides whether to store it. Thin, duplicated or canonicalised-away pages get crawled and then discarded.

Ranking

Only now do the familiar factors apply — relevance, links, quality signals, intent match.

Serving

What actually appears, which is increasingly a summary or an answer rather than ten blue links.

How should a site architecture diagram be drawn?

As a tree, with the homepage at the top and depth measured in clicks. The single number to read off it is how many clicks it takes to reach the pages that matter.

Three clicks is the conventional target and it is a guideline rather than a law. What matters is that important pages are not buried behind pagination, faceted filters, or a category level that exists only to tidy the navigation.

What to look for in a site architecture diagram
CheckHealthyWarning sign
Depth to key pagesThree clicks or fewerFive or more
Orphan pagesNoneAny page with no internal link in
Category breadthBalancedOne category holding most pages
Duplicate pathsOne canonical route per pageThe same page under several URLs
Dead-end pagesEvery page links onwardLeaf pages with no outbound internal links
Navigation coverageKey pages in the navImportant pages reachable only by search

Orphan pages are the most common finding and the easiest to fix. They usually appear because a page was published outside the normal flow — a landing page, a campaign page, something built for an email — and nobody ever linked to it from the site itself.

Bar chart showing content gaps and cannibalisation as the main things a cluster diagram reveals.
The gaps are usually more valuable than the plan, because they are the part you could not have listed from memory.

What is a topic cluster diagram for?

Planning content so that a group of pages reinforces one another instead of competing. It is the practical answer to accidentally publishing four pages about the same thing.

The structure is a pillar page covering a subject broadly, surrounded by pages covering specific questions in depth, all linked to the pillar and to each other where relevant. Drawn out, it makes cannibalisation obvious before it is published rather than after.

The pillar

Broad, covers the subject at survey depth, links out to every cluster page.

The cluster pages

Each answers one specific question thoroughly, and links back to the pillar.

Where two cluster pages genuinely relate, link them. Not everything to everything.

One intent per page

The rule the diagram exists to enforce. Two pages chasing the same intent split their own signals.

The gaps

Drawing the cluster shows you which questions you have not covered, which is frequently more useful than the plan itself.

The pruning candidates

Old posts that overlap a cluster page should be merged or redirected, not left to compete.

How does a URL structure diagram differ from an architecture diagram?

Architecture describes how pages relate; URL structure describes what they are called. They are usually drawn together and they are not the same decision, which is why one frequently ends up contradicting the other.

A site can have a sensible three-level hierarchy and URLs that encode a completely different shape — flat slugs under a hierarchical navigation, or folders that no longer match the categories they were named for. Neither is fatal on its own, but the mismatch makes every later decision about canonicals, breadcrumbs and redirects harder than it needed to be.

URL structure decisions worth making before a build
DecisionThe usual right answerWhy
Folders or flat slugsFolders where hierarchy is realBreadcrumbs and reporting both use it
Dates in URLsNo, for evergreen contentThey make an old page look stale
Category in the URLOnly if a page has one categoryMulti-category pages create duplicates
Trailing slashPick one and enforce itBoth forms resolving is a duplicate
CaseLowercase everywhereUppercase variants resolve separately on some servers
Word separatorHyphensUnderscores are not read as word breaks

The trailing-slash row causes more confusion than its size suggests. If both forms return a page rather than one redirecting to the other, every URL on the site exists twice, and the split shows up in reporting long before anyone traces it to its cause.

Do you need a redirect map diagram for a migration?

You need a redirect map. Whether it is drawn or held as a spreadsheet matters far less than whether every old URL that had traffic or links appears in it.

This is the least glamorous item on the list and the one whose absence causes the most damage. Migrations lose rankings overwhelmingly because URLs changed and nothing pointed the old ones at the new ones — not because of anything subtle.

What the redirect map has to contain
ColumnWhy
Old URLThe complete list, from logs and analytics, not from memory
New URLOne destination, not a category page for everything
Status code301 for permanent; 302 signals the move is temporary
Had trafficPrioritizes what to verify first
Had external linksThe equity you actually stand to lose
Verified after launchThe column that is always missing

Redirecting everything to the homepage is the classic shortcut and it is treated as a soft 404 — the old page’s signals are not carried across, and the visitor lands somewhere that does not answer why they clicked.

What tools do people use to draw these?

Anything that draws boxes. The diagram is a thinking aid, and the value is in the decisions it forces rather than in the rendering.

The one genuinely useful distinction is between drawings you make by hand — architecture, clusters — and drawings generated from real data, such as an internal link map produced by a crawler. The generated ones tell you what the site actually is; the hand-drawn ones tell you what you intended.

How should an SEO diagram be made accessible?

A diagram that exists only as an image is unavailable to anyone using a screen reader, and unavailable to the search engines you are drawing it for. The fix is to publish the underlying structure as text alongside it, not to write a longer alt attribute.

Alt text has a practical ceiling. It works well for “a bar chart showing crawl requests falling by roughly half after the robots.txt change” and badly for a site architecture with forty nodes, because a single unstructured sentence cannot convey a hierarchy. Trying to force it produces alt text nobody can follow.

For anything structural, publish the same information twice: the diagram for people who read visually, and a nested list, a table, or a short passage of prose for everyone else. A site architecture diagram becomes a nested list of sections and their children. A crawl-index-rank flow becomes an ordered list of stages. The text version is usually easier to keep current than the image, and it is the version a language model can actually read.

This is also why an SVG beats a flattened PNG for these. Text inside an SVG stays selectable and searchable, the diagram stays legible when someone zooms, and it does not blur on a high-density display the way an exported bitmap does.

Who is the diagram actually for, and how does that change it?

Draw a different diagram for an engineer, an executive and a writer. The most common reason a diagram fails is that one version is shown to all three.

An engineer needs precision: real URL patterns, actual status codes, the specific rule that fires. Ambiguity there causes implementation mistakes, and a tidy diagram that omits the awkward exceptions is worse than no diagram, because it will be built exactly as drawn.

An executive needs the shape and the consequence. Forty nodes is noise; three boxes and an arrow showing where the traffic is being lost is a decision aid. If the diagram needs narrating to make sense, it is the wrong diagram for that room.

A writer or subject-matter expert needs to see where their work sits and what it should link to. That is a topic map, not an architecture, and the useful version usually omits the technical layer entirely. Redrawing the same information three ways is not duplicated effort — it is the difference between a diagram that gets acted on and one that gets admired and filed.

Planning a site structure or a migration?

Progression Agency is a New York City firm working with clients across the United States. If you only make one of these, make the redirect map — it prevents the failure that costs the most.

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Video: SEO fundamentals

Background viewing on how search works and how sites are structured. The guidance above is written out in full; these are context rather than the answer.

Getting found in search

AI, AEO and what is changing

Paid media and lead generation

Websites and design

Choosing and working with an agency

Social, content and brand

By industry and by situation

Frequently asked questions

What is an SEO diagram?
Any drawing used to explain how search works or how a site is organized. The phrase covers about six unrelated diagrams that happen to share a name.
What are the main types of SEO diagram?
Crawl-index-rank flow, site architecture, internal link map, topic cluster, URL structure, and redirect map. Each answers a different question.
What does the crawl-index-rank diagram show?
How a page reaches search results: discovery, crawling, rendering, indexing, then ranking. Its value is showing where a page can drop out before it ever competes.
Why does the crawl stage matter more than ranking factors?
Because a page that is not discovered, crawlable or indexed cannot rank at all. Most real problems sit in those stages rather than in optimization.
What is the rendering stage?
Where JavaScript runs and content that only exists after execution may or may not be seen, depending on how much render budget the page receives.
How do you draw a site architecture diagram?
As a tree, homepage at the top, depth measured in clicks. The number to read off it is how many clicks it takes to reach the pages that matter.
How deep should pages be?
Three clicks or fewer to important pages is the conventional target. It is a guideline; what matters is that key pages are not buried behind pagination or filters.
What is an orphan page?
A page with no internal links pointing to it. They usually appear because something was published outside the normal flow and never linked from the site.
What should I look for in an architecture diagram?
Depth to key pages, orphan pages, lopsided categories, duplicate routes to the same page, dead-end pages, and whether key pages appear in the navigation.
What is an internal link map?
A diagram, usually generated by a crawler, showing which pages link to which. It shows what the site actually is rather than what you intended it to be.
What is a topic cluster diagram?
A pillar page covering a subject broadly, surrounded by pages covering specific questions, all linked to the pillar. It exists to stop pages competing with each other.
What does a cluster diagram actually reveal?
Mostly the gaps — questions you have not covered — and cannibalisation, where two pages chase the same intent and split their own signals.
What is keyword cannibalisation?
Two or more pages targeting the same intent, so neither accumulates the signals it would have had alone. Drawing the cluster makes it visible before publishing.
Should every cluster page link to every other?
No. Link cluster pages to the pillar always, and to each other only where the relationship is genuine. Linking everything to everything makes the links meaningless.
What is a URL structure diagram?
A tree of folders and slugs, drawn before a build or migration. It is cheap to change on paper and expensive to change after launch.
What is a redirect map?
A list mapping every old URL to its new destination. It is the single most important artefact in any migration.
What columns does a redirect map need?
Old URL, new URL, status code, whether it had traffic, whether it had external links, and whether the redirect was verified after launch.
Can I redirect everything to the homepage?
No. Bulk redirects to the homepage are treated as soft 404s, the old page’s signals are not carried across, and the visitor lands somewhere that does not answer their click.
Should redirects be 301 or 302?
301 for a permanent move, which is what a migration is. A 302 tells the engine the change is temporary and the old URL should be kept.
Why do migrations lose rankings?
Overwhelmingly because URLs changed and nothing pointed the old ones at the new ones. It is rarely anything subtle.
Where do I get the list of old URLs?
From server logs, analytics, the existing sitemap and a crawl — not from memory. Pages nobody remembers are frequently the ones carrying external links.
What tools draw SEO diagrams?
Anything that draws boxes. The value is in the decisions the diagram forces, not the rendering, so the tool matters less than actually doing it.
Which diagrams are hand-drawn and which are generated?
Architecture and clusters are drawn by hand and express intent. Internal link maps are generated from a crawl and express reality. Comparing them is the useful exercise.
How often should the architecture diagram be updated?
Whenever the structure changes. It is a living document, unlike a redirect map, which matters intensely for about two weeks and then becomes a record.
If I only make one diagram, which one?
The redirect map, if you are migrating. Otherwise the topic cluster, because it prevents the content problem that is hardest to unwind later.

Sources and further reading

  1. Google Search Essentials — SEO starter guide
  2. Google: creating helpful, reliable, people-first content
  3. Google: intro to structured data
  4. Google: LocalBusiness structured data
  5. Google: FAQPage structured data
  6. Google: Article structured data
  7. Google: Product structured data
  8. Google: title links in search results
  9. Google: control your snippets
  10. Google: robots.txt introduction
  11. Google: sitemaps overview
  12. Google: consolidate duplicate URLs
  13. Google: redirects and Search
  14. Google: JavaScript SEO basics
  15. Google: multi-regional and multilingual sites
  16. Google Search Central Blog
  17. Google: get started with Search Console
  18. Google: how local search results are determined
  19. Google Business Profile: prohibited and restricted content
  20. Google Business Profile: address and service area guidelines
  21. Google Business Profile: review policy
  22. Google Business Profile: add or edit categories
  23. Google Ads: location targeting settings
  24. Google Ads: about negative keywords
  25. Google Ads: about Quality Score
  26. Google Ads: importing offline conversions
  27. Google Ads: about Smart Bidding
  28. Google Ads: about Performance Max
  29. Google Local Services Ads: eligibility and screening
  30. Google Ads: keyword match types
  31. Google Analytics 4: about conversions
  32. Google Analytics 4: attribution models
  33. US Census Bureau QuickFacts: New Jersey
  34. US Census Bureau: American Community Survey
  35. US Census: Statistics of US Businesses
  36. Bureau of Labor Statistics: New Jersey data
  37. BLS: Occupational Employment and Wage Statistics
  38. NJ Department of Labor: labor market information
  39. New Jersey Business Action Center
  40. US Small Business Administration: New Jersey district
  41. USA.gov: business resources
  42. web.dev: Core Web Vitals explained
  43. web.dev: Largest Contentful Paint
  44. web.dev: Cumulative Layout Shift
  45. web.dev: Interaction to Next Paint
  46. Google PageSpeed Insights
  47. Google Rich Results Test
  48. Google Search Console
  49. W3C Markup Validation Service
  50. Schema.org: LocalBusiness type
  51. Schema.org: Service type
  52. Schema.org: FAQPage type
  53. Schema.org: HowTo type
  54. W3C: WCAG 2.2 quick reference
  55. FTC: CAN-SPAM Act compliance guide
  56. FCC: telemarketing and robocall rules (TCPA)
  57. FTC endorsement guides — reviews and testimonials
  58. FTC: rule on consumer reviews and testimonials
  59. HHS: HIPAA guidance on online tracking technologies
  60. New Jersey Courts: attorney advertising guidelines
  61. New Jersey DCA: construction codes and permits
  62. New Jersey Home Improvement Contractor registration
  63. New Jersey Division of Consumer Affairs
  64. TikTok for Business
  65. TikTok Creative Center
  66. TikTok Ads Help Center
  67. TikTok Community Guidelines
  68. TikTok Terms of Service
  69. TikTok Privacy Policy
  70. TikTok Safety Center
  71. TikTok Transparency Center
  72. TikTok Creator Portal
  73. TikTok Newsroom
  74. TikTok for Developers
  75. TikTok advertising solutions
  76. TikTok Creator Marketplace
  77. TikTok Business Center
  78. TikTok for Business blog
  79. TikTok Creative Center: top ads
  80. TikTok Branded Content policy
  81. TikTok Shop for sellers
  82. Instagram for Business
  83. Instagram for Creators
  84. Instagram Help Center
  85. About Instagram
  86. Meta Business Suite
  87. Meta Business Help Center
  88. Meta Transparency Center
  89. About Meta
  90. Meta: Instagram platform docs
  91. YouTube Creators
  92. YouTube Official Blog
  93. YouTube Shorts help
  94. How YouTube Works
  95. YouTube Studio
  96. LinkedIn Marketing Solutions
  97. LinkedIn Help
  98. Pinterest Business
  99. Pinterest Business Help
  100. Snapchat for Business
  101. X for Business
  102. Reddit communities
  103. Reddit for Business Help
  104. ASCAP
  105. BMI
  106. SESAC
  107. Global Music Rights
  108. PRS for Music (UK)
  109. PPL (UK)
  110. SOCAN (Canada)
  111. APRA AMCOS (Australia)
  112. GEMA (Germany)
  113. SACEM (France)
  114. SIAE (Italy)
  115. JASRAC (Japan)
  116. IFPI
  117. RIAA
  118. National Music Publishers Association
  119. Harry Fox Agency
  120. SoundExchange
  121. Music Reports
  122. Epidemic Sound
  123. Artlist
  124. Soundstripe
  125. PremiumBeat
  126. AudioJungle
  127. Free Music Archive
  128. Creative Commons
  129. Incompetech
  130. FTC: advertising and marketing
  131. FTC: disclosures 101
  132. FTC: endorsement guides
  133. FTC: consumer reviews rule
  134. FTC: advertising FAQs
  135. US Copyright Office
  136. US Copyright Office: DMCA
  137. US Copyright Office: music FAQ
  138. US Copyright Office: fair use FAQ
  139. USPTO: trademarks
  140. UK Advertising Standards Authority
  141. ACCC (Australia)
  142. Competition Bureau Canada
  143. GDPR overview
  144. California Consumer Privacy Act
  145. COPPA
  146. FTC: children’s privacy
  147. W3C Web Accessibility Initiative
  148. W3C: WCAG
  149. W3C: captions
  150. W3C: making audio and video accessible
  151. ADA.gov
  152. WebAIM
  153. Epilepsy Foundation
  154. Pew Research: internet and technology
  155. DataReportal
  156. US Census Bureau
  157. US Bureau of Labor Statistics
  158. Interactive Advertising Bureau
  159. Think with Google
  160. Google Trends
  161. Nielsen insights
  162. Schema.org: VideoObject
  163. Schema.org: SocialMediaPosting
  164. Schema.org: MusicRecording
  165. Schema.org: HowTo
  166. Schema.org: FAQPage
  167. Schema.org: Organization
  168. Google: video best practices
  169. Google: video structured data
  170. CapCut
  171. Adobe Premiere Rush
  172. DaVinci Resolve
  173. Canva
  174. Descript
  175. VEED
  176. Kapwing
  177. Otter.ai
  178. Later
  179. Buffer
  180. Hootsuite
  181. Sprout Social
  182. Google Analytics
  183. Google Search Console
  184. Google Analytics developer docs
  185. GA4: events and conversions
  186. Matomo
  187. Plausible Analytics
  188. Similarweb
  189. UK Information Commissioner’s Office
  190. Office of the Privacy Commissioner of Canada
  191. Australian OAIC
  192. European Data Protection Board
  193. EU data protection
  194. EU Digital Services Act
  195. Ofcom
  196. FCC
  197. AIGA
  198. Nielsen Norman Group
  199. Smashing Magazine
  200. web.dev
  201. MDN: web media
  202. MDN: the video element
  203. ISO 21001 (reference)
  204. Buma/Stemra (Netherlands)
  205. STIM (Sweden)
  206. Teosto (Finland)
  207. Koda (Denmark)
  208. TONO (Norway)
  209. IMRO (Ireland)
  210. SGAE (Spain)
  211. ZAiKS (Poland)
  212. KOMCA (South Korea)
  213. MCSC (China)
  214. CISAC
  215. World Intellectual Property Organization
  216. TikTok: creating videos
  217. TikTok: exploring videos
  218. TikTok: privacy settings
  219. TikTok: growing your audience
  220. TikTok Creator Academy
  221. TikTok Effect House
  222. TikTok for small business
  223. Instagram: Reels help
  224. YouTube: Shorts best practice
  225. How YouTube recommends
  226. Pinterest Predicts
  227. Snapchat for Business
  228. Hootsuite blog
  229. Social Media Examiner
  230. Marketing Week
  231. Adweek

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