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Basic knowledge of memory

Welcome to the Memory!


What is computer memory? In computing, memory refers to a device that is used to store information a temporary or permanent basis for immediate use in a computer or related computer hardware device. The term "memory" is often synonymous with the term "primary storage" or "main memory".

Memory can be either volatile and non-volatile memory. Volatile memory (RAM) is memory that loses its contents when the computer or hardware device loses power. Non-volatile memory, sometimes abbreviated as NVRAM, is memory that keeps its contents even if the power is lost. EPROM is an example of non-volatile memory.


Computer memory is divided into main or primary memory (RAM and ROM) and auxiliary secondary memory (hard drive,CD,etc.). Main memory holds instructions and data when a program is executing, while auxiliary memory holds data and programs not currently in use and provides long-term storage.

There are a lot of semiconductors memory types, all with their own applications, characteristics and construction. This page lists the different semiconductors memory types which are described on the semiconductors memories guide.


The memory cells are grouped into words of fixed word length, for example 1, 2, 4, 8, 16, 32, 64 or 128 bit. Each word can be accessed by a binary address of N bit, making it possible to store 2 raised by N words in the memory. 

When a program, such as your Internet browser, is open, it is loaded from your hard drive and placed into RAM. This process allows that program to communicate with the processor at higher speeds. Anything you save to your computer, such as a picture or video, is sent to your hard drive for storage.

Semiconductor memories used in a wide variety of applications. This category contains pages explaining various semiconductor memory applications.

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