BooleanTable

BooleanTable[bf] gives a list of truth values for all possible combinations of variable values supplied to the Boolean function bf.

BooleanTable[expr, {a1, a2, ...}] gives a list of truth values of the Boolean expression expr for all combinations of values of the ai.

Examples

Truth table for AND:

BooleanTable[a && b, {a, b}]
(* {False, False, False, True} *)

Truth table for OR:

BooleanTable[a || b, {a, b}]
(* {False, True, True, True} *)

Please visit the official Wolfram Language Reference for more details.