Once a program is transferred from the disk into the RAM chips, it is ready to be run. The program's instructions are read by the CPU and carried out. Perhaps part of the RAM will be used for a scratch pad to hold data as it is being changed. For instance, if you are writing a letter with a word processing program, that letter will exist in the RAM. If the power was turned off, the letter would be lost unless you first copy it onto a disk.

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