What is a Sitemap? Why it is used?
Sitemap is a file which provides all the links (not private links) of the content present in the website
Suppose there are two e-books around 300 pages, both have a similar content, but only 1st book have a Table of Content. Which book would you like to read? Obviously 1st. The main reason behind this is, Table of Content helps readers to find their topic quickly and easily. Without Table of Contents, reader need to go throughout the book and find their topic.
For websites, Sitemaps does a same role as I mention above for e-books.