What is an ASP.NET web form?

[fatal1234]

I feel a bit silly asking such a simple question. I'm taking my first web programming course and I just had a quick question about ASP.NET web forms. What exactly is an ASP.NET web form?My understanding is that they are web pages that can get information from a user and then process process information on the server. Once processed, the information can be displayed to the user by changing the page's HTML. I did ask my prof and was told that ASP.NET web forms are simply forms that "inheret from the Page(page?) class". This explanation has left me a bit confused which is why I'm now asking the question...Am I missing a fundemental concept?Thank you