Content within a website often contains a mix of related topics, presented in posts and pages. The site structure deals with how the content is grouped, linked, and presented to the visitor. Google can more easily index the content and URL’s of a site if it is structured well.
If done correctly, how an article ranks in search engines can be influenced by site structure. Internal links, navigation, and breadcrumbs are website structure tools along with taxonomies, such as article categories and tags.
Well-organized site structure is also important because, without it, articles on the same website can compete with themselves for ranking in search engines. Site structure is a way of communicating to Google and other search engines which content and articles are the most important.