What is Computer Memory and Its Types


Hello Friends, today we will tell you in detail about “what is computer memory”. Humans have brains to remember some passages, in the same way, computers have memory to remember the data. This memory is an integral part of the Central Processing Unit. It is also called the main memory of the computer, internal storage, or primary memory. So, we will learn “what is computer memory” in detail in this article.

What is Computer Memory

By the way, the CPU is called the brain of the computer, but where the human brain acts like a lot of work to keep our memories safe, the CPU can only calculate the arithmetic calculation and logical calculation Input processes the process, the process cannot secure the data, now that the process data is also protected, and this is the work of computer memory. Computer memory has been divided into many smaller parts, which we call the cell. Each cell has a unique address or path. Every time you save a file in a computer, it is saved in a cell.

Computer Memory

There is more than one memory in computers, we can generally classify it as Cache memory, Primary memory, and Secondary memory. The primary memory is both volatile and non-volatile. Temporary Memory keeps the data from being temporarily computer-to-computer, until the computer turns off, i.e., if the computer is suddenly shut down or the power is lost, then the data is destroyed from the computer. Permanent Memory starts your computer Are helpful in doing this. There is some very useful firmware that helps the computer to boot. The process of starting a booting computer is called main memory. Secondary storage is the one that keeps our data for a long time. Secondary storage comes in many forms. Floppy disk, hard disk, cd Etc.

Types of Computer Memory

  1. Cache Memory
  2. Primary Memory
  3. Secondary Memory


  1. Cache Memory

Cache memory is very fast. In this memory, most of the programs and instructions used to be freely used are stored. So that CPU – Central Processing Unit can work faster.

Cache Memory is located between CPU and Main Memory. That is, the CPU already receives store data and instructions in Cache Memory. And avoid the repetition of the work. Because he no longer has to go to primary memory to get instructions and data for any work. That’s why CPU works fast.

In Cache Memory, these data and instructions are sent through the operating system. Those are then used by the CPU. The Store Capacity Limited of this memory is limited. So it has to be cleaned again and again. This data is not of the user’s work.

Features of Cache Memory

  • Cache memory is faster than primary memory.
  • Data is stored temporarily in it.
  • The instructions and instructions for most used programs and tasks are stored in the store.
  • Its storage capacity is limited.
  • Stored data needs to be cleaned again and again.
  1. Primary Memory

Memory is the most important part of the computer where data, information, and programs are present during the process and available immediately if required. This memory is unstable memory because the data written in it erases when the computer is switched off or the electricity Primary Memory is called. This is also called primary memory or main memory.

Primary Memory is mainly of two types

  1. RAM
  2. ROM

1) RAM (Random Access Memory)


RAM or Random Access Memory computers have Temporary Memory. Data inputted from the keyboard or any other input device is stored prior to the process and the CPU is stored. The data or programs stored in the RAM are temporarily stored in the RAM as required by the computer, when the computer is switched off or gone, the data stored in the RAM is erased. Therefore, RAM is called volatile or temporary memory. RAM has many capacities, such as 4 MB, 8 MB, 16 MB, 32 MB, 64 MB, 128 MB, 256 MB etc.

Types of RAM:

  • Dynamic RAM
  • Static RAM

2. ROM (Read only memory)


The full name of Rome is Reed Online Memory. This is Permanent Memory which is programmed to store at the time of computer creation. Store programs cannot be converted and destroyed in this storage, they can be read-only. So this memory is called read-only memory. Data stored in Rome is not destroyed even after the computer has been switched off. Therefore, Rome is called non-volatile or permanent memory.

There are different types of ROM which are the following

  • PROM (Programmable Read Only Memory)
  • EPROM (Erasable Programmable Read Only Memory)
  • EEPROM (Electrical Programmable Read Only Memory)


  • PROM

PROM’s full name is Programmable Read Only Memory. It is such a memory that once the data is stored, it cannot be deleted or changed.


The full name of EPROM is Erasable Programmable Read Only Memory. It is similar to the PROM, but the stored program can be erased by ultra-violet rays and new programs can be erased. Can be done.


The full name of EEPROM is Electrical Programmable Read Only Memory. New technology is also EEPROM, in which the program can be erased from the lawful method of memory.

Features of Primary Memory

  • This memory is temporary.
  • It is a part of the CPU.
  • After the power supply is completed, the data is automatically deleted.
  • Without this, the computer cannot work.
  • Primary Memory is faster than Secondary Memory.
  1. Secondary Memory

It is also known as External (Extra) and Non-Volatile Memory. It uses to store data permanently. The data stored in this memory is always safe. Which users and computers can access at any time.

Secondary memory is not part of the CPU. Its data goes back to the main memory only after the CPU can use it. Its storage capacity is very high. E.g., Hard Disks, CD, DVD, Pan Drives etc.

Features of Secondary Memory

  • This is permanent memory.
  • Data is always stored.
  • Its speed is a little lower.
  • Store capacity is very high.
  • Data is kept safe even when the work is done or the computer is closed.

Computer Memory Unit

The way in which to measure time in seconds, the decibels is for measuring the voice, a millimeter is for measuring the distance and gram is for measuring the weight, Similarly, there is also a unit which is used to measure storage capacity in the computer world. It is called the unit of computer memory or unit

The smallest unit of computer memory is a bit. Bit binary sign i.e. 0 and 1 only has a pair value (binary value) and when the four bit is merged then it is called nibble, that is, a group of 1 nibbling = 4 bit and 8 bits are called byte.

8 Bits = 1 Bytes

Kilobyte (1 KB) = 1024 Bytes

Megabyte (1MB) = 1024 KB

Gigabyte (1 GB) = 1024 MB

Terabyte (1 TB) = 1024 GB


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