LED, or Light Emitting Diode, is a semiconductor device that emits light when an electric current passes through it. Known for their energy efficiency and long lifespan, LEDs are widely used in various applications, from household lighting to electronic displays. The advantages of LEDs include lower energy consumption and reduced heat output compared to traditional incandescent bulbs. They are available in a range of colors and can be used in everything from streetlights to televisions, making them a versatile choice for modern lighting solutions.