RAM: Main memory of a computer that stores data, applications and the operating system. If the power is turned off, the RAM loses it's data.
ROM: A store of data in the computer which can't be overwritten. It is not lost when the computer is turned off.
Virtual Memory: A section of the hard disk used as if it was RAM when there isn't enough main memory.
Flash memory: Low cost secondary storage used by portable devices.
Cache memory: Special high speed memory
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