The memory in a computer that holds programs and data for rapid access during execution of a program; it usually hold the largest quantity of rapid-access storage in a computer; -- also called RAM (random access memory. It is contrasted to ROM, disk data storage, cache, registers and other forms of data storage.
This is the big store house of data located within the main computer outside of the microprocessor. At times the Main Memory may send in data or instructions for the Prefetch Unit, which often get stored at an address in the Instruction Cache to be used later.
That area in the CPU where programs are stored before data can be processed or a program can be executed. RAM is temporary memory; when you turn the computer off it is emptied out.