what is the difference between the html site map and xml site map?? why is this xml site map so important???? N google can't crawl this html site map or what???
XML is a predefined data structure that is easier to manipulate. But, as to why a preference of one over the other, I think that is simply Google likes it better (due to faster processing times and more flexibility). ?? Anyone think otherwise?
To understand and see the differences check this sitemaps article. It has code examples and explanations of all sitemap file kinds.