Main Memory

• Main memory is the principle internal memory system of the computer system.
•  It is also called as primary memory.
• It is the working space used by the computer to hold the program that is currently running, along with the data it needs to process.
• Primary is fast.
• Primary memory is volatile in the sense that memory contents are lost when the computer is switched off. 
• Primary memory is normally made of semiconductors.
• Primary memory is small in sixe relative to the secondary memory.
• Main memory is attached to the processor via its address and data buses.