RAM (Random Access Memory)

RAM stands for Random Access Memory. It is read/write memory. It is an area in the computer system that temporarily holds users data & programs. It contents are lost when the power supply is switched off. That's why, it is said volatile memory.

There are two kinds of RAM.
1) S RAM (static RAm)
- It is the fatest kind of RAM because it does not need to refresh.
- Made up of transistor.(Transisor Storage Voltage)
- access time is 5 to 10 ns (nano second)
- costly.
2) DRAM (Dynamic RAM)
- It is a bit slower than SRAM because it needs to refresh every few nano second.
- Made up of capacitor.(Capacitor store power)
- access time is 15 to 60 ns (nano second)
- cheap.
Note :- SRAM is used inside the processor. It is about 10 times more costly than DRAM.

2) Access time :-
Access time is taken by CPU (Central processing Unit) to access memory locations of RAM is called access time. Icase of DRAM the access time will be more because it need to refresh time to time.