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.

Answer 2

One is a server control (the asp button) that when rendered on the page includes javascript that handles the postback logic, as well as being exposed to your code-behinds as a control you can address by its ID. The Html control is platform agnostic, and is rendered by your browser as just a button. That button will raise click events but will not POST your form.