Sitemap.

Sitemap is a hierarchical representation of the architecture of a web site. Usually it is a webpage that lists the pages on a web site. This helps visitors and search engines find pages on the site.

Most search engines will only follow a finite number of links from a page, so if a site is very large, the site map may be required so that search engines and visitors can access all content on the site.

XML Sitemaps.
Google introduced Google Sitemaps so web developers can publish lists of links from across their sites. The sitemap files can then be used to indicate to a web crawler how such pages can be found. Google, MSN and Yahoo now jointly support the Sitemaps protocol.

We recommend using www.freesitemapgenerator.com service. The big advantage over other sitemap generators is that it automatically sets a priority for particular webpages.