Electric Circuit whose output depends upon the input in a way that can be expressed as a
function in symbolic Logic; it has one or more binary (see Numeration) inputs (capable of assuming either of two states, e.g., on or off) and a single binary output. Logic circuits that perform particular functions
are called gates. Basic logic circuits include the AND Gate, the OR Gate, and the NOT Gate, which perform the logical functions AND, OR, and NOT. Logic circuits, which
are mainly used in digital Computers, can be built from any binary electric or electronic devices, including Switch, Relay, Electron Tube, solid-state Diodes, and Transistors.