DRAM is the Hershey's chocolate of readable/writable memory:

it's not the best, but it's cheap, does the job, and is

available almost everywhere you look. DRAM data resides in a

cell made of a capacitor and a transistor. The capacitor

tends to lose data unless it's recharged every couple of

milliseconds, and this recharging tends to slow down the

performance of DRAM compared to speedier RAM types.