A Sitemap is a map of your website. A site map is helpful for people wanting to navigate to a specific page within your website. Further it is helpful for spiders crawling and indexing your website.
There are two types of Sitemaps, HTML and XML. HTML Sitemaps are for your customers, to navigate their way through your website. XML sitemaps helps the search engines to crawl your site much more efficiently meaning you get the best possible rankings you can by letting the search engine see your website.
Every time you update your website, your Sitemap will be updated. The search engines will identify new content and it is a factor to influence you page rank. XML Sitemaps are supported by most of the search engines.
