It’s a lot like a subway map. It shows the structure of your website and where are your pages reside.
Creating a sitemap is easy. You can find sitemap generators online that will create the .xml file for you. Once you get the .xml file, simply upload it to the root directory of your website (e.g. www. website.com/sitemap.xml). If your website is updated regularly, make it a good practice to update your xml file at least once a month so search engines have the freshest data.