Memory is the virtual storage closet in your computer that holds data so that the microprocessor can retrieve it promptly. There is a distinction between memory and storage, however. Memory, also called physical memory, refers to the information stored on RAM, or Random Access Memory, chips, whereas storage describes only data stored either on floppy or hard disks. There is also virtual memory, which is additional memory created when the computer temporarily uses storage space on the hard disk as memory. There are several different types of memory, the main type being RAM. Every computer comes with RAM built in, which provides the ability to quickly recall data from the hard disk. Additionally, there is ROM, or read only memory, PROM, programmable read-only memory, EPROM, erasable programmable read-only memory, and EEPROM, electrically erasable programmable read-only memory. ROM is memory that can only be read. PROM allows you to store program information on a memory chip, but doesn't allow you to erase the data or write over it. EPROM is a sort of PROM memory that allows the user to erase stored programmed data and write over it using exposure to ultraviolet light. EEPROM is also a type of PROM that allows you to erase programmed data through exposure to an electrical charge. For more information on memory, consult a computer professional
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