Memory is device that its function is to process data or instruction. The greater memory which provided more and more data and instruction that can be processed.
RAM is a device that its function to save the data. RAM is tentative or saved data can be deleted. Difference with ROM, ROM has function that equals with RAM but ROM is permanent or saved data can't be deleted.
Random Access Memory or RAM is a computer storage which its content can be accessed in the constant period; it is not care about data position is memory. This is variance with massage memory device, as tape of magnetic, disk and drum, whereabouts movement mechanical of storage media forces computer to access the data alternately.
It is first known in 1960. Just in that time, it is semiconductor memory and not yet popular because its price is very expensive. That time it is more common to use magnetic main memory. Semiconductor Company such as Intel begins its debut with produces RAM, more correct is DRUM type.
RAM usually can be written and read, variance with Read Only Memory or ROM, RAM usually being used for main memory in computer to be used and changes information in an active manner, even several devices use some RAM type to provide a long-term secondary.
But there is also that opines that ROM is other type of RAM because its character that actually also random access as well as SRAM or DRUM. Just really writing process in ROM needs to special process that not easy and flexible as well as in SRAM or DRUM. Besides that, several parts of space address RAM of a system which is mapped into one or two ROM chip.
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