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RAM :  Randon Access Memory

   This is read write memory that the processor accesses for fetching the instructions to execute,  the data needed for in an instruction execution, and to store the data as a result of execution of an instruction.  The contents of this memory are erased when the power is down.

   This is read only memory.  This is the memory that is not destroyed when computer is switched off.  So important instructions about the computer starting  are stored in ROM.

 EPROM : electrically erasable programmable ROM.
   The data in the chip can be erased by electrical signal in a special eraser device.  Then the new data is entered in it.

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