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A computer has two types of memory, RAM or random access memory and ROM or read only memory. With read only memory, the computer can read the memory but can not change it. It tells the computer how to work. Random access memory is memory that can be changed. It tells your computer what to do. Once you are finished with the random access memory, you can use the space it occupied for other tasks.

The two are analogous to the way your body works. You have both kinds. If you tell your hand to pick up a pencil, you are using random access memory. You are telling your hand to do one of many possible different instructions. You do not need to tell your hand which tendons, muscles, veins, arteries, nerves, and bones to use in the process. Those instructions are built in. That is analogous to read only memory.

Soon after you picked up your pencil, you have forgotten you picked it up. You have started to draw a picture or add some numbers. You are using your short term memory for something else. It does not matter what. Soon you will forget that also. You will forget the start of a project. You will remember the finished product. You may save that. You can not save that in random access memory but you can save your drawing or math homework.

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15y ago

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