websites urls without file extension?

Question

When I look at Amazon.com and I see their URL for pages, it does not have .htm, .html or .php at the end of the URL.

It is lik

Answer 1

A lot of people are using an more "RESTful" type architecture... or at least, REST-looking URLs.

This site (StackOverflow) dosn't show a file extension... it's using ASP.NET MVC.