Explain why one type of RAM is considered to be analog and the other digital?

DRAM is made with cells that store data as charge on capacitors. The presence or absence of charge on a capacitor is interpreted as a binary 1 or 0. Because capacitors have a natural tendency to discharge, dynamic RAMs require periodic charge refreshing to maintain data storage. The term dynamic refers to this tendency of the stored chrage to leak away, even with power continuously applied.

SRAM is a digital device, using the same logic elements used in the processor. In a SRAM, binary values are stored using traditional flip-flop logic-gate configurations. A static RAM will hold its data as long as power is supplied to it.

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