A sitemap is a file that includes the different pages of a website and the path to them through the sections of the website. The pages can be arranged visually or as plain text and this sort of a file is rather useful for two reasons. The first is that it makes it a lot easier for the visitors to find a specific page they need, which means that they can navigate your website better and quicker, which in turn will increase their user experience and it will be more likely that they will come back to the site or will recommend it to other people. The second reason is that a sitemap makes it possible for search engines to index your content better, especially if it's updated, so when users are trying to find specific content, it's more likely that they will come across your Internet site since it will be listed higher in their search results. In case your Internet site is not indexed efficiently, 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.