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ROM: Read Only Memory is used to provide a set of basic system functions, including a power-on self-test (POST) and the ability to boot into more sophisticated system software (the operating system).

RAM: Used by the computer to store software and data in an area easily accessible to the CPU (central processing unit). It is called Random Access Memory, because the memory can be accessed in any order using an addressing scheme. Only data and software stored in RAM can be directly accessed by the CPU.

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