A site map (or sitemap) is a list of pages of a web site.
There are three primary kinds of site map:
Sitemaps may be addressed to users or to software. Many sites have user-visible sitemaps which present a systematic view, typically hierarchical, of the site. These are intended to help visitors find specific pages, and can also be used by crawlers. Alphabetically organized site maps, sometimes called site indexes, are a different approach.
They also act as a navigation aid by providing an overview of a site's content at a single glance.