What is Site Map and distinguish between HTML sitemap and XML sitemap?

XML sitemap protocol is specifically intended for search engine spiders.
HTML is just a general overview of the site, just the pages and info a user needs.

Hi Friend,
The difference is that XML sitemaps are written for search engines and HTML sitemaps are written for humans. An XML sitemap is specifically written for search engine spiders. ... An HTML sitemap enables lost human users to find a page on your site that they are looking for.