Flip-flop

In electronics, a flip-flop is a circuit that has two stable states and can be used to store state information.
A flip-flop is usually controlled by control signals that can include a clock signal. The outputs usually include the complement as well as the normal output.Today the word latch is mainly used for simple transparent storage elements, while slightly more advanced non-transparent (or clocked) devices are described as flip-flops. Informally, as this distinction is quite new, the two words are sometimes used interchangeably.A circuit incorporating latches or flip-flops has state; its output depends not only on its current input, but also on its previous inputs. Such a circuit is described as sequential logic.