An SEO glossary of terms every marketer should know in 2026
A practical, current glossary covering the essential SEO terminology every marketer should be comfortable with, from foundational concepts to 2026-specific terms.
6 min read
Site architecture — how pages are organised, categorised and linked to one another — affects both how easily Google can crawl and understand your site's structure, and how effectively authority flows from your strongest pages to the ones that need it most. Poor architecture can bury genuinely valuable content where neither users nor search engines easily find it.
The 'three clicks' guideline, and why it is a guideline, not a rule
A common rule of thumb suggests keeping every important page reachable within three clicks from the homepage. This is not a strict technical limit Google enforces, but pages buried deeper than this tend to receive less internal link equity and get crawled less frequently, which correlates with weaker performance in practice.
- Homepage to category to subcategory to product is a common, reasonable four-level depth for e-commerce.
- Deeply nested blog archives (year/month/day/post) often bury content unnecessarily compared to a flatter structure.
- Orphaned pages — reachable by no internal link at all — are the most extreme version of this problem.
Flat versus hierarchical structures
A flatter structure, where more pages sit closer to the homepage, generally distributes authority more evenly but can become unwieldy for very large sites without clear categorisation. A hierarchical structure organises content logically but risks burying deep pages — the right balance depends on site size and content type.
Site architecture is really a question about where you want your authority to flow, made concrete through the literal structure of your links.
Practical structuring principles
Group related content into clear categories with dedicated hub pages, link consistently from those hub pages to their subordinate content, and ensure your highest-priority pages sit as close to the homepage as their content type reasonably allows. Our topic clusters and pillar pages guide covers one effective structuring pattern in more depth.
- Organise content into clear, logical categories with dedicated hub or category pages.
- Link consistently and prominently from hub pages down to relevant subordinate content.
- Avoid burying genuinely important pages more than three or four clicks deep without good reason.
- Check for and fix orphaned pages with no internal links pointing to them at all.
Auditing your current architecture
A crawl of your own site using a tool like Screaming Frog reveals click depth for every page, letting you identify important content buried too deep and orphaned pages with no internal links at all — both worth fixing directly.
Frequently asked questions
Does URL depth (number of slashes) matter as much as click depth?
Click depth — how many links a user or crawler must follow from the homepage — generally matters more than the literal URL slash count, though a shallow URL structure often naturally correlates with shallow click depth too.
Can too flat a structure also be a problem?
Yes, for very large sites, an overly flat structure with hundreds of top-level pages and no clear categorisation can be just as confusing to both users and search engines as excessive depth.
How do I find orphaned pages on my own site?
Compare a full crawl of your site's internal links against your complete list of live URLs (from your CMS or sitemap) — any URL that exists but receives no internal links is orphaned.
If you want a full site architecture audit to find buried or orphaned content, get in touch with our team.
The takeaway
Aim to keep every important page reachable within three clicks from the homepage — depth beyond that is where authority and crawl priority both start to genuinely thin out.
Written by Fibvo — Bengaluru and Erode, India — working with clients in other time zones. Questions, or think we have it wrong? Tell us.
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