Random access memory is a type of computer storage whose contents can be accessed in a fixed position ignores the data in memory. This is in contrast to sequential memory devices, such as magnetic tapes, disks and drums, in which the mechanical movement of the storage media to force the computer to access data sequentially.

First time in 60'an known. Only when the semiconductor memory that has not been popular because the price is very expensive. When it is more common to use a magnetic main memory.

Semiconductor companies like Intel to start producing debut with RAM, more precisely type of DRAM.

Usually RAM can be written and read, as opposed to memory-read-only (read-only-memory, ROM), RAM is usually used for primary storage (main memory) for use in computer and change the information actively, although some tools to use several types RAM to provide a secondary storage of long-term.

But there is also the opinion that the ROM is another type of RAM, because it is really too random access as SRAM or DRAM. Only it was the process of writing the ROM requires a special process that is not as easy and flexible as well as SRAM or DRAM. Also some parts of the space addres RAM (main memory) of a system that is mapped into one or two chip ROM.