What are the basic logic gates and their truth tables?

The basic logic gates are AND (output 1 only when all inputs are 1), OR (output 1 when any input is 1), NOT (inverter, outputs complement of input), NAND (AND followed by NOT), NOR (OR followed by NOT), XOR (output 1 when inputs are different), and XNOR (output 1 when inputs are same). NAND and NOR are universal gates as any logic function can be implemented using only NAND or only NOR gates.