Random access memory (RAM) is a type of data storage memory. It is a volatile form of storage. Now-a-days, the RAMs available in the market are taken the form of integrated circuit which helps us to access them in any order.

The word random refers that any piece of information or data can be returned in a constant time, irrespective of its physical location and any link with the previous data accessed. On the other hand, storage devices like tapes, magnetic disks etc. are totally dependent on the reading head and the physical movement of the recording medium. The retrieval time depends on the physical position of the next piece of data.

RAM is associated with volatile type of memory in which the information is lost as the power is switched off. The types of the read access memory are-

1. DRAM
2. SRAM
3. ZRAM
4. TTRAM

Today, there are many types of data storage memories are available. The store a bit of data generally either as a charge in the transistor or capacitor gate like in DRAM also known as dynamic RAM, EPROM, EEPROM and flash or in the state of flip flop as in SRAM known as static RAM.

• ROM types RAM generally uses metal mask to permanently disable/enable selected transistors in spite of storing the charge.

• SRAM and DRAM have been used as persistent storage in the traditional computers whereas the newer computers rely on flash memory, when not in use, to store data. The flash memory is used in PDAs and in small music players.

• Besides Flash memory, NOR RAM is the only which is capable in true random access. NOR-RAM is used many instead of ROM. NOR-RAM allows direct code execution.

• In DRAM, to represent a single bit of data, a capacitor and transistor are paired in a cell. DRAM is the commonly used computer memory.

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