Sitemaps are extremely important from a search engine optimization (SEO) point of view.
Simply adding a sitemap does not affect search rankings. However, if there is a page on your site that is not indexed, then sitemap provides you a way to let search engines know about that page.
Sitemaps are extremely useful for when you first start a blog or create a new website because most new websites don’t have any backlinks. This makes it harder for search engines to discover all of their content.
Find our Sitemap guides here