A Light Emitting Diode (LED) is a semiconductor device that emits light when an electric current passes through it. LEDs are known for their energy efficiency and long lifespan compared to traditional light sources like incandescent bulbs. They work by electroluminescence, where electrons recombine with holes in the semiconductor material, releasing energy in the form of light. LEDs are used in a variety of applications, including display screens, traffic lights, and household lighting. They come in different colors and sizes, making them versatile for both functional and decorative purposes. Their low power consumption and durability make them a popular choice in modern lighting solutions.