http://computer.howstuffworks.com/rom.htm
ROM- (Read Only Memory) Integrated circuit Programmed with specific data when manufactured.
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RAM- (Random Access Memory) Memory that can access any memory cell directly if you know the row and column that its in.
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Caching- based on memory sub-system of a computer. Allows computer tasks to be done more rapidly.
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Virtual Memory- Looks for areas in RAM that have not been recently used and copies them to hard drive to free up RAM space for new applications.
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