Flip Flop are an application of gates. You can create memory with the help of boolean logic. Flop Flops can be considered as basic idea of RAM. When a certain input value is given to them, they will be remembered and executed if logic gates are design correctly.

1. SET RESET Flip Flop is design with the help of two NOR gate and two NAND gats. 

TRUTH TABLE OF S-R FLIP FLOP

2.D Flip Flops is actually a slight modification of clocked SR flip Flop. 

TRUTH TABLE OF D FLIP FLOP

3. J K Flip Flop can also be considered as a modification of S R flip Flop. The only difference is that the intermediate state is more refined and precise than that of S R flip flop.

TRUTH TABLE OF J K FLIP FLOP

4. T Flip Flop is simpler version of J K Flip Flop. Both J and K inputs are connected together and thus are also called a single input J k flip flop. When clock pulse is given to the flip flop, the outputs begin toggle.

TRUTH TABLE OF T FLIP FLOP