Stiffa, seeing as you've admitted how dumb the question is, and this is the newbie section, I'm going to be nice.
Honestly, this is not the place to be asking for such basic information.
Also, this isn't really marketing information. This is basic web design info. As such, you'd be better off going to a proper web design forum and getting the info from there. It'll be more in depth, and people will be politer about it, as it's their field.