A sitemap is a file that includes the different pages of an Internet site and the way to them through the sections of the site. The webpages can be organized visually or as plain text and such a file is rather useful for two reasons. The first is that it makes it a lot easier for the website visitors to find a certain page they need, so they can navigate your website better and quicker, which in turn will improve their user experience and it'll be more likely that they will revisit 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 is updated, so when users are trying to find specific content, it's more likely that they will come across your site because it will be listed higher in their search results. In case your Internet site is not indexed properly, it might not show up for some searches, so even if you have what people want, they will simply not get to your Internet site.