A flip-flop is a device that stores a single bit (binary digit) of data; one of its two states represents a "one," and the other represents a "zero". Such data storage can be used for storage of state, and such a circuit is described as sequential logic in electronics. Flip-flops come in many different forms, but all use two stable states (or "stored values") to represent binary information. For example, one state might represent an electrical signal being high (for instance, 5 volts), while another state might represent that signal being low (for instance, 0 volts).   At its core, a flip-flop is essentially an electronic switch that can have two possible states – ‘on’ or ‘off’. By varying the voltage level of the input signals to the switch, we can set the output to either one state or the other. This means that each flip-flop has two possible states – one representing a ‘one’ and the other representing a ‘zero’ – which allows us to store binary data in them.   The two states of the flip-flop are usually referred to as SET and RESET, with SET representing a ‘one’ and RESET representing a ‘zero’. To change from one state to another requires both an input signal (or series of signals) as well as an external clock source which will trigger the transition from one state to another. The clock source can either be an external pulse generator, such as those used in microprocessors, or it can be derived from within the circuit itself using an RC oscillator or crystal oscillator circuit.   Types of Flip-Flops   There are several different types of flip-flops available today, ranging from simple asynchronous switches like SR latches to more complex synchronous devices such as JK flip-flops. Each type has its own unique characteristics, which make them ideal for certain applications. For example, JK flip-flops are commonly used in digital logic circuits because they offer greater flexibility than other types due to their ability to toggle between states without requiring any additional inputs besides their own CLK signal.