So do i understand this right?

Question

so forms are just to gather information from the users of the website.. for making it more interactive or something?

Answer 1

To make it more interactive (like a login screen) or to request data (email address to subscribe to a mailing list or contact information if you need to contact them for something) or even gather comments (about the page, a bug tracking list for software ) ect.

They can be used for a lot of things

Answer 2

You understand what a form is, yes.