What is computer memory? Mention the types of computer memories with example.

Subject Introduction to Computer System

A memory is just like a human brain. It is used to store data and instructions. Computer memory is the storage space in the computer, where data is to be processed and instructions required for processing are stored. The memory is divided into large number of small parts called cells. Each location or cell has a unique address, which varies from zero to memory size minus one. For example, if the computer has 64k words, then this memory unit has 64 * 1024 = 65536 memory locations. The address of these locations varies from 0 to 65535.

Memory is primarily of three types −

Cache Memory

Primary Memory/Main Memory

Secondary Memory


The memory of the computer is divided into two categories:
1.Primary Memory
2.Secondary Memory

Primary Memory
This is the main memory of the computer. CPU can directly read or write on this memory. It is fixed on the motherboard of the computer.

Primary memory is further divided in two types:
1.RAM(Random Access Memory)
2.ROM(Read Only Memory)


Secondary Memory
This memory is permanent in nature. It is used to store the different programs and the information permanently (which were temporarily stored in RAM). It holds the information till we erase it.

Different types of secondary storage devices are:

Hard Disc, Compact Disc, DVD, Pen Drive, Flash Drive, etc.


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