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The smallest piece of data a computer stores — a single 0 or 1, like a switch that's off or on.
A binary digit. The fundamental unit of information, taking one of two values (0 or 1). Eight bits make a byte; groups of bits encode numbers, characters, and machine instructions.
An information-theoretic unit equal to one shannon — the entropy of a uniformly distributed binary random variable. In hardware, realized as a two-state circuit (voltage high/low, magnetic polarity, charge present/absent).