If you have some doughts about sitemap, here are most popular FAQs about sitemap which will get you know the answer of very basic to most important question.
1)What is a sitemap? 2)What is XML or search engine (Google, yahoo) sitemap? 3)Why XML sitemap?
1)What is the link limit or maximum size limit in XML sitemap? 2)How do I notify to Google if I have more than one sitemap file? 3)Why to use sitemap generator tool?
1)Where should I place my Sitemap? 2)What is the importance of XML sitemap in Search Engine Optimization (SEO)? 3)How to validate my XML sitemap?
1) How to create sitemap index file?