A Sitemap makes navigation of your site much easier and helps make your site easier to pick up by search engines. Those are the two main reasons that a sitemap is essential to your search engine optimization, but there are many reasons you should be using a sitemap on every single website that you create. When you use a sitemap, search engines are immediately in the know about updates and changes that you make to your site. While it may not mean your pages are indexed immediately, it will definitely be quicker than if you didn’t have a sitemap as part of your search engine optimization plan.