What is A Sitemap?
A sitemap is a complete list of pages on your site. You can create this document manually, but it’s not recommended. The maintenance is too much work, once your site is up and you start to publish. It’s best to use a sitemap generator that will create and maintain your sitemap automatically every time you add or delete a page.
A sitemap is essential for SEO; it helps the search engine spiders collect information for each page on your site, it is done in the background automatically. All you have to do is make sure your site is crawlable, and the search engine spiders do the rest.