A sitemap is very important for search engine optimization because it allows se's be aware of your site architecture

https://source-wiki.win/index.php/Best_Practices_for_Creating_Shareable_Content_that_Improves_Organic_Reach.

A sitemap is most important for website positioning as it is helping engines like google realise your site shape, making it more uncomplicated for them to move slowly and index your pages.