Hi.... sitemap is list of pages of website which is accessible by crawler or user. there is two popular version of the sitemap one is XML version and another is HTML version.
hile site maps can be organized in a variety of ways, most use an outline form, with pages arranged by topic. This gives visitors a good overall picture of how the site is organized and clearly defines all the resources the website has to offer.
The work of a site map is to give your site a proper directions and keeping their way clear to work along with your site.