From PropertyMinder WIKI
The sitemap page is submitted to major search engines. The site map page helps the search engine index your page in the correct category. Sitemap is an important consideration for someone who is interested in search engine optimization to increase the natural ranking of the site in search engines.
The site map page displays the Slogan, agent/office name, web-site URL, list of web-site pages (links), agent contact information and agent profile. This information effectively helps the search engine categorize your website into the appropriate category by location and services.