A Field-Effect Transistor (FET) is a type of transistor that uses an electric field to control the flow of current. It is widely used in electronic devices for switching and amplifying signals. FETs are known for their high input impedance and low power consumption, making them ideal for various applications, including amplifiers and digital circuits. The operation of a FET is based on the voltage applied to its gate terminal, which creates an electric field that influences the conductivity of a channel between the source and drain terminals. This unique feature allows FETs to be more efficient than traditional bipolar junction transistors (BJTs) in many scenarios.