A sitemap is a file that lists all the pages on a website, along with additional metadata about each page. A sitemap can be useful for SEO because it helps search engines discover and crawl the pages on a website more efficiently.
While a sitemap is not strictly necessary for SEO, it can be helpful for websites with a large number of pages or for websites with pages that are not easily discoverable by search engines. A sitemap can also be useful for websites with frequently changing content, as it helps search engines stay up-to-date with the latest pages and content on the website.
Overall, while a sitemap is not required for SEO, it can be a useful tool for helping search engines discover and crawl the pages on a website, which can in turn help improve the website’s visibility in search results.