A Light Emitting Diode (LED) is a semiconductor device that emits light when an electric current passes through it. LEDs are energy-efficient and long-lasting, making them a popular choice for lighting, displays, and indicators in electronics. Compared to traditional incandescent bulbs, LEDs use significantly less energy and have a longer lifespan. They are used in a wide range of applications, from household lighting and street lamps to television screens and traffic signals. The development of LED technology has also enabled high-definition displays in devices such as smartphones, tablets, and large outdoor screens.