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A JFET (Junction Field-Effect Transistor) is a type of transistor that controls current flow using an electric field. It has three terminals: gate, drain, and source. Unlike BJTs, JFETs are voltage-controlled devices, meaning a voltage applied to the gate regulates the current between the drain and source. JFETs come in N-channel and P-channel types, where current flows through an N-type or P-type semiconductor channel, respectively. They are known for having high input impedance, making them useful in applications requiring minimal power consumption or signal distortion, such as amplifiers and switches.