Website structure is how your pages are organised and linked to one another, the hierarchy that runs from the homepage down through categories to individual pages. A logical structure helps search engines crawl efficiently and helps visitors always understand where they are.
In a flat structure, any page is reachable within a few clicks of the homepage; in a deep structure, important pages sit buried many levels down. Flatter is usually better, because pages close to the homepage tend to receive more internal link juice and get crawled more often. Aim to keep key pages within about three clicks of the home page.
An online store filed all 600 products directly under the domain root with no categories. Crawl depth was inconsistent and many products went unindexed. Restructuring into Category, Subcategory, then Product cut average click depth from six to three, and the count of indexed product pages climbed from about 340 to 580 within two crawl cycles. For larger sites, our technical SEO team maps crawl depth and link flow before recommending a new architecture.