JFET stands for Junction Field Effect Transistor. It is a type of transistor used in electronic circuits to control current and voltage. It is a voltage-controlled device with three terminals, the gate, drain, and source. The gate is used to control the current flow between the drain and source, which is determined by the voltage applied to the gate. The JFET allows for precise control of current and voltage, making it ideal for applications such as amplifiers, communications, and switching. It is also used in low-power and low-noise applications.