Difference between asp:button and html's button

Question

I\'m learning asp.net. I have question about example buttons

I can use two types of button.

Answer 1

Each click will make a round trip to server, which should not occur everytime. HTML Button is much lighter and should be used to make client - logic like client validation, run client script,etc....
ASP button will makes a POST everytime you click, html button do not.