A sitemap is a file that includes the different pages of a website and the route to them through the sections of the site. The web pages can be sorted visually or as plain text and such a file is very useful for 2 reasons. The first is that it makes it a lot easier for the visitors to find a certain page they need, which means that they can navigate your website better and much faster, which in turn will increase their user experience and it'll be more likely that they will return to the Internet site or will recommend it to other people. One more reason is that a sitemap permits search engines to index your site content better, especially if it is updated, so if users are interested in particular content, it is more likely that they will come across your Internet site as it will be listed higher in their search engine results. In case your site is not indexed effectively, it may not appear for some searches, so even in case you have what people want, they will simply not get to your Internet site.