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1. ROM: Stands for read only memory and you cannot change whats on it , it is non volatile they are generally hard wired into the computer

2. RAM: stands fro random access memory , it is used by programs to store info required to run the software . It is also used to store instructions that are sent to the cpu . RAM is volatile which means it wipes itself when the power turns off.

3. Virtual memory is an extension of ram that works just like ram. It is set up on the hard drive using page file. the page while is generally set a twice the ram amount