In electronics, a flip-flop or latch is a circuit that has two stable states and can be used to store state information. This guide unites logic gates combinations - from NAND to JK master-slave. It is mostly made by JustPlaying. Logic NOR Gate.jpg|Logic NOR Gate Logic NAND Gate.jpg|Logic NAND Gate Logic XNOR Gate.jpg|Logic XNOR Gate Logic Gates are usually combined with a NOT Gate - to improve usability of the certain gate. NOT gate just invertes the final signal coming from the Gate. Here are the combinations - * AND + NOT = NAND * OR + NOT = NOR * XOR + NOT = XNOR