Boolean Logic & Logic Gates

The logic gates AND, OR and NOT, their truth tables, and combining them in logic circuits.

Computers make decisions using Boolean logic (true/false, 1/0) built from logic gates.

The main gates

The AND gate (output 1 only if both inputs are 1) and the OR gate (output 1 if either input is 1).

AND: output 1 only if both inputs are 1.

OR: output 1 if either (or both) input is 1.

NOT: inverts the input (1 → 0, 0 → 1).

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