What is the main memory?

What is the main memory?

• A. ROM
• B. Hard disk
• C. RAM
• D. CD-ROM

Answer: (C)

Main memory is the fast, temporary workspace the CPU uses to hold data and instructions that are actively in use. This is RAM, volatile memory that lets the processor access information quickly while programs run. Because it’s volatile, its contents disappear when the power is off, which is why you must save work to non-volatile storage later. ROM, by contrast, stores essential firmware and isn’t used for general working data. Hard disks and CD-ROMs are long-term storage devices that hold large amounts of data but are much slower to access, so they aren’t the main memory.

Main memory is the fast, temporary workspace the CPU uses to hold data and instructions that are actively in use. This is RAM, volatile memory that lets the processor access information quickly while programs run. Because it’s volatile, its contents disappear when the power is off, which is why you must save work to non-volatile storage later. ROM, by contrast, stores essential firmware and isn’t used for general working data. Hard disks and CD-ROMs are long-term storage devices that hold large amounts of data but are much slower to access, so they aren’t the main memory.