What is it and What is it Used For?
RAM means Random Access Memory. It stores the memory that your computer is using up at the current time but what the computer is switched off everything in the RAM is deleted. This is your computer's temporary memory, the permanent memory is called the Hard Disk. If your computer does not have very much RAM then it will be quite slow because it wont have anywhere to store the new memory and will have to make space. However, if your computer has a lot of RAM then it will run quite quickly because it still has loads of space (the speed of you computer however has more to do with your CPU- central processing unit than this).
Computer Basics | What is RAM Memory?