What is Primary Memory?

As we know, memory is one of the main parts of a computer. In a computer system, it is divided into two parts, which we call primary and secondary memory. What is Primary Memory in this post? (What is Primary Memory).

What is Primary Memory 

Primary memory is the main memory of a computer, which usually stores the type of data or program that is currently being processed by the Processing Unit (CPU). There are mainly three types of Primary Memory which includes RAM, ROM and Cache Memory. They have very low storage capacity but provide much faster access to data than secondary storage.

It is both Volatile and Non-volatile. Where volatile means those memory devices that only store data until the computer is turned on, while non-volatile is one that can store data for a long time. Since it is located very close to the CPU in the Main Circuit Board, the CPU reads the data in Primary Memory very fast.

Primary Memory is also called Internal Memory and Primary Storage. These memory are usually made from semiconductor material and are more expensive than secondary storage.

Some salient features of primary memory:

  • Stores the programs or data that are currently being processed by the CPU.
  • Primary Memory is connected directly to the CPU in the computer.
  • This is a semiconductor memory.
  • Primary memory is much faster than secondary storage.
  • These are quite expensive as compared to secondary storage devices.
  • Computers cannot function without Primary Memory.

What is Primary Memory?

There are a total of three types of Primary Memory in a computer system:

  1. RAM
  2. ROM
  3. Cache Memory


RAM means Random Access Memory. This is called the main memory of the computer. Whenever you open a software or file in a computer, they are first loaded in RAM, after which they are processed by the CPU. Whatever you are doing in easy language in the computer, it is running somewhere in RAM.

Therefore it is called Temporary Memory, because it only stores any data as long as the CPU needs it. It is much faster than other storage devices. RAM is mainly volatile in nature, ie the data in it is deleted as soon as the computer is turned off. There are mainly two types of RAM: SRAM and DRAM.


ROM means Read Only Memory. As its name suggests, it is only readable, that is, it can only read data stored in the program or any modification or modification is not possible or easy. So usually those fixed programs are stored in ROM Chip which do not need to be modified again. For example, Computer ROM has a program store named Firmware, which is responsible for starting the computer.

The nature of ROM is non-volatile, that is, the program or data in it is not erased even when the computer is switched off. It stores data Permanently. However, it stores a very small amount of data. ROM is a slow memory and it is cheaper than RAM. There are generally three types of ROMs: PROM, EPROM and EEPROM.

Cache Memory

The cache memory in a computer is a small size memory, which often stores the requested data and instructions so that they are immediately available to the CPU when needed. Cache Memory stores data temporarily. This is very fast memory that lies between the CPU and RAM in the computer. Cache memory is a very important part of modern day computers.

Whenever a CPU performs a task, there are many instructions that it needs repeatedly, Cach Memory provides those instructions to the CPU immediately. Which improves the performance of the computer. Usually this memory is inbuilt with the CPU in the computer or is present in the computer as a separate chip.

So hopefully, what is Primary Memory? (What is Primary Memory)? You must have known this. One important thing if you find the information informative and useful, then share it on your social media so that other people can get this information with your support. Other posts related to computer fundamentals are given below. You can continue reading by clicking on them.

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