MOSFETs are high-efficiency semiconductor devices used for switching and amplification in electronic circuits. Unlike BJTs, they are voltage-controlled and offer high input impedance, making them ideal for low-power and high-speed applications. MOSFETs are classified into N-channel and P-channel types, with N-channel being more commonly used due to lower resistance and higher efficiency. They are widely used in power supplies, motor control, RF amplifiers, and digital circuits. Their fast switching speed, low power consumption, and high efficiency make them essential in consumer electronics, automotive, and industrial applications.