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Logic gates
Logic gates are the basic building blocks of digital computing. A logic gate is an electrical circuit that has one or more than one input and only one output. The input controls the output and the logic is isomorphic with Boolean connectives defined in terms of truth-tables.
[A gate consists in] three connections where there may or may not be some electricity. Two of those connections are places where electricity may be put into the device, and the third connection is a place where electricity may come out of the device. (Scott, 2009)
References
Scott, J. Clark. 2009. But how do it know?: the basic principles of computers for everyone. Self-published.