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It needs the several types of memory so it can hold all of the stuff that you save on your computer.
A typical computer has:
- level 1 and level 2 catches
- normal system RAM
- virtual memory
- a hard disk


I hope I helped!
Different types of memory are used for specific functions that are required for the computer to operate.

The BIOS is a set of instructions stored in a memory chip on the Motherboard. It tells the computer how to perform a number of basic functions such as booting. It is also used to identify and configure hardware like the optical drive, cpu etc.

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