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A MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) is a type of transistor that controls current using an electric field. It has three main terminals: gate, drain, and source. MOSFETs are voltage-controlled devices, meaning the voltage applied to the gate controls the current flow between the drain and source. They come in two types: N-channel and P-channel, with N-channel being more common. MOSFETs are widely used for switching and amplifying signals, especially in digital circuits and power electronics, due to their fast switching speed, low power consumption, and high efficiency.