It is computer memory which temporarily stores information. It resides on the system motherboard and is implemented as circuit cards contain a number of semiconductor chips.
These conductor chips are:
Single-in-line memory module (SIMM)
Dual in-line memory module (DIMM).
Types of RAM are:
Dynamic RAM (DRAM)
Synchronous Dynamic RAM (SDRAM)
Random DRAM (RDRAM)
It speeds up computer performance storing data which the computer has recently used.