Static RAM (SRAM) is a type of volatile Random Access Memory. Volatile memory needs to be regularly refreshed otherwise its contents is erased.

Unlike DRAM which uses a single transistor per bit, SRAM is implemented as a Flip-Flop and uses 6 transistors per bit (or memory cell). This allows each cell to retain its value longer than a DRAM cell, but makes it larger, hence more expensive per bit.