Site architecture is the way a website's pages are organised, connected by internal links, and accessed through a logical hierarchy. It determines how easily both users and search engines can navigate and understand your content.
A good site architecture has: a flat structure (most pages reachable within 3 clicks from the homepage), logical URL paths (/services/web-design-for-restaurants rather than /page?id=42), breadcrumb navigation on all sub-pages, a sitemap.xml file listing all URLs, and a robots.txt file directing crawlers appropriately.
Poor site architecture leads to: crawl budget waste (Google crawls useless pages while missing important ones), orphan pages (pages with no internal links pointing to them, invisible to search engines), keyword cannibalisation (multiple pages competing for the same search term), and confusing navigation that increases bounce rate.
For business websites, the ideal architecture groups content into clear silos: core pages (Home, About, Services, Contact), service sub-pages (/services/[niche]), content pages (Blog, Answers, Glossary, Concepts), and product/offer pages (Pricing, Playbook, Engine). Each silo should internally link to related content in other silos to reinforce topical authority.
Internal linking is the connective tissue of site architecture. Every page should reference related content. Blog posts should link to relevant concepts. Glossary terms should link to relevant answers. Service pages should link to related case studies.