A sitemap is a file which includes the different pages of an Internet site and the path to them through the sections of the site. The pages can be arranged visually or as simple text and such a file is quite useful for two reasons. The first is that it makes it faster and easier for the visitors to discover a certain page they need, which means that they can navigate your Internet site better and quicker, which in turn will increase their user experience and it will be more likely that they will return to the site or will recommend it to other people. The second reason is the fact that a sitemap makes it possible for search engines to index your site content better, especially when it's updated, so if users are interested in particular content, it's more likely that they'll come across your Internet site since it will be listed higher in their search results. If your Internet site is not indexed well, it might not appear for some searches, so even in case you have what people want, they will not get to your website.