What type of transistor has a gate, drain, and source?

A Field-Effect Transistor (FET) is a specific type of transistor that relies on an electric field to control the conductivity of a channel. Its three primary terminals are named the gate, drain, and source. The voltage applied to the gate controls the current flowing between the drain and the source. By contrast, a bipolar junction transistor (BJT) uses different terminology for its three terminals: base, emitter, and collector. Varistors and Hall-effect sensors are entirely different types of components used for surge protection and magnetic sensing, respectively.