DRAM

DRAM – Dynamic Random Access Memory – composed from cells in a solid state array which can have a positive or negative charge, signalling binary one or zero values. The charge has to be constantly refreshed by electricity , and it is lost when the power is switched off; hence it is dynamic or volatile. The cells can be individually addressed – randomly addressed – as opposed to stored locations on a tape which have to be serially addressed as the tape streams through a drive.