A sitemap is a visual or text map of an Internet site - an index of all webpages arranged in sections as they show up on the site. The sitemap is a single file and its presence may have a crucial effect on the popularity of your website, especially when you have more content. It will enable your visitors to browse through the webpages and find what they need faster, that will raise the possibility for them to come back to the Internet site or to show it to colleagues and friends. The sitemap is also required for search engines to index your site content better, so some pages will show up in the results for specific searches, which will most likely not happen without having a sitemap even when you have the required website content. This is especially valid if you modify some pages because the sitemap tells the search engines that they must crawl the site again so as to index the latest content. Having a sitemap today is a necessity rather than an optional feature for every successful website.