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Boolean logic deals with two values: true and false. It's the basis for all digital electronics and computer decisions.

Logic Gates

• AND Gate: The output is TRUE only if all inputs are TRUE. Otherwise, FALSE.
• OR Gate: The output is TRUE if at least one input is TRUE. Otherwise, FALSE.
• NOT Gate: The output is the opposite of the single input.

Truth Tables

A truth table shows all possible input combinations and the resulting output for a gate or circuit.

Example Truth Table (AND Gate)

Input A	Input B	Output
FALSE	FALSE	FALSE
FALSE	TRUE	FALSE
TRUE	FALSE	FALSE
TRUE	TRUE	TRUE

Combining Gates into Circuits

You can combine gates to create more complex circuits. Example: a security system might trigger an alarm only if both a motion sensor (Input A) AND a door sensor (Input B) are active.