Securely Transfer User Entered Password

Hi,
 I am new to ASP .Net MVC. I just wondered, how do I encrypt user entered password when he/she logs in into my site? The scenario is as follows:

1) A registered user visits my side and clicks Log In
2) Enteres his registered User Name and Password and clicks Log In
3) Browser sends the above two plain strings (code wise), to the server.
 Here, how do I send the password securely to the server? I am not able to understand how it works in ASP .Net MVC generated HTML files. Can you please help me to understand this?
Thanks,
Adengappaa