A sitemap is a file which contains the different pages of a website and the way to them through the sections of the website. The web pages can be arranged visually or as simple text and such a file is really useful for two reasons. The first one is that it makes it much easier for the visitors to discover a certain page they need, so that they can navigate your site better and a lot faster, that in turn will improve their user experience and it'll be more likely that they will come back to the Internet site or will recommend it to other people. One more reason is that a sitemap permits search engines to index your content better, especially if it's updated, so when users are searching for particular content, it's much more likely that they'll come across your site since it will be listed higher in their search results. In case your Internet site is not indexed well, it may not show up for some searches, so even in case you have what people require, they will simply not get to your Internet site.