A computer RAM stands for Random Access Memory. RAM is a kind of data storage device. It comes in the category of volatile memory which means that it retains data only when there is power supply. If the power supply is cut off then all its data in the memory is lost. They are made of integrated circuits which acts as storage space to store the data. The word Random, means that data can be retrived from the RAM in any order regardless of the physical location of the data and whether or not it is related to the previous piece of data. Types Of RAM : There are two types RAM. SRAM (Static RAM) and DRAM (Dynamic RAM). SRAM or Static Random Access Memory is a type of semiconductor memory. SRAM uses around four to six transistors for each memory cell. Each bit is stored in a memory cell which has either of the two stable states, 0 or 1. Due to more number of transistors present in each cell, the cells do not need to be refreshed frequently. Refreshing a cell means re- writing data in a cell. But it is still volatile in the sense that data is eventually lost when there is no power supply. SRAM is faster than DRAM in accessing data. DRAM or Dynamic Random Access Memory is a type of RAM where each memory cell contains a pair of a transistor and a capacitor. Each memory cell stores a bit of data in the capacitor. Since capacitors leak charge, the data in each cell eventually fades away unless the capacitor charge is refreshed periodically. Since the memory cells have to be refreshed periodically it is a dynamic memory. DRAM consumes less power compared to SRAM. And it is also less expensive than SRAM because it contains only a pair of a transistor and a capacitor compared to six transistors in SRAM.