The CPU is the central processing unit that can execute commands.
It performs the basic arithmetical, logical, and input/output operations of the system.
RAM
RAM only allows you to access data from one session, i.e if you creat a word document on your RAM, then forget to save it to your Hard drive you cannot access as it is dumped after the computer is powered off.
Graphics card
A graphics card is an expansion card which generates output images to a display or monitor.
Video hardware is often integrated into the motherboard, however all modern motherboards provide expansion ports to which a video card can be attached.
Expensive Graphics cards are often used for high-tech Gaming purposes.
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