•Dynamic RAM (DRAM)—DRAM is a RAM device that requires periodic refreshing to retain its content.
•Static RAM (SRAM)—SRAM is a RAM device that retains its content as long as power is supplied by an external power source. SRAM does not require periodic refreshing and it is faster than DRAM.
•Non-Volatile RAM (NVRAM)—NVRAM is a special type of SRAM that has backup battery power so it can retain its content after the main system power is shut off. Another variation of NVARM combines SRAM and EEPROM so that its content is written into the EEPROM when power is shut off and is read back from the EEPROM when power is restored.
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