Research yourself what RAM does.
Regardless of the point of a forum - there are guides online that will be able to explain it a lot better than we can on a forum
C'mon guys he asked a valid question. Sure he could have done some research on his own, but instead of bullying him and pushing him away, maybe throw some encouragement his way. We were all new to this at one point. Frankly, this type of attitude can apply to every single question posted here which would make this place a lot quieter.
@OP: Here's what a quick google search brought up. It's pretty basic but can help to start to point you in the right direction. Any more questions, feel free to ask, but definitely do some research on your own. It helps to spur discussion and can give you even more questions that are more suitable to a forum.