If you have website a sitemap is not likely to be a new concept to you. It is simply an extra page added to your web site that links to all other pages used to let a search engine know which pages are most relevant and important. The sitemap tells the search engine exactly where all of the pages are and identifies them so they can be crawled and indexed appropriately.

Read more on web design and sitemap influence on SEO: Use a Sitemap to Improve Rankings