Logic (digital electronics)

Logic in digital electronics represents and manipulates binary values with circuits implementing Boolean operations. It underlies combinational and sequential systems, from simple gates to processors.

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Logic gate: An electronic circuit that implements a Boolean operation on one or more binary inputs. Logic gates are the physical units that implement digital Boolean operations.
Binary number: A number represented using only the digits zero and one. Digital logic encodes its values and data using binary digits.
Combinational logic: Digital logic whose outputs depend only on the current inputs. It covers circuits that compute results without storing prior input state.
Analog electronics: Electronics that represent information through continuously varying signals. Digital logic abstracts signals into discrete values rather than processing continuous variation.
Boolean algebra: An algebraic system in which variables take truth values and operations include AND, OR, and NOT. Its equations describe how digital circuits combine and invert binary values.
Boolean function: A function whose inputs and output take values from a two-valued set, commonly zero and one. Every combinational logic circuit implements a Boolean function.
Sequential logic: Digital logic whose outputs depend on current inputs and stored state. Feedback and storage let logic circuits represent state and change over time.
Three-valued logic: A logic system whose variables can take one of three truth values. It extends beyond the two-valued convention used by ordinary binary circuits.
Complementary metal–oxide–semiconductor: A semiconductor technology that uses complementary pairs of field-effect transistors to build low-power integrated circuits. CMOS transistors form the switching networks in most modern logic circuits.
Truth table: A table listing a Boolean function’s output for every possible input combination. Truth tables specify circuit behavior before it is built from gates.