SRAM, or Static RAM, is a type of computer memory that doesn't need a "refresh". DRAM has capacitors which hold data that need to be explicitly refreshed thousands of times every second with a power charge in order to continue to hold that data. SRAM holds its data for as long as it has power connected to it, and does not require active refresh. However, it is more expensive than DRAM, and is therefore only commonly used in CPU caches. It isn't much like ROMs or EEPROMs.