Field-Effect Transistors (FETs) are a type of transistor that control the flow of current using an electric field. They are widely used in electronic devices due to their high input impedance and low power consumption. FETs come in various types, including MOSFETs and JFETs, each serving different applications in circuits. These transistors are essential components in modern technology, enabling functions in everything from amplifiers to digital switches. Their ability to efficiently manage electrical signals makes them crucial in the design of integrated circuits and microprocessors, contributing to the advancement of electronics and computing.