The Free On-line Dictionary of Computing (30 December 2018):

static random-access memory
SRAM
static RAM

    (SRAM) Random-access memory in which each bit of
   storage is a bistable flip-flop, commonly consisting of
   cross-coupled inverters.  It is called "static" because it
   will retain a value as long as power is supplied, unlike
   dynamic random-access memory (DRAM) which must be regularly
   refreshed.  It is however, still volatile, i.e. it will lose
   its contents when the power is switched off, in contrast to
   ROM.

   SRAM is usually faster than DRAM but since each bit requires
   several transistors (about six) you can get less bits of SRAM
   in the same area.  It usually costs more per bit than DRAM and
   so is used for the most speed-critical parts of a computer
   (e.g. cache memory) or other circuit.

   (1995-04-22)