A Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) is a type of transistor used to amplify or switch electronic signals. It consists of three main parts: the source, the drain, and the gate. The gate is insulated from the channel by a thin layer of oxide, allowing it to control the flow of current between the source and drain without direct electrical contact. MOSFETs are widely used in various electronic devices, including computers, smartphones, and power supplies. They are favored for their efficiency and ability to handle high-speed operations, making them essential components in modern electronics and integrated circuits.