Light-emitting diodes, or LEDs, are semiconductor devices that emit light when an electric current passes through them. They are highly efficient and can produce various colors depending on the materials used in their construction. LEDs are commonly used in a wide range of applications, including lighting, displays, and indicators. One of the main advantages of LEDs is their energy efficiency, as they consume less power compared to traditional incandescent bulbs. Additionally, LEDs have a longer lifespan, often lasting tens of thousands of hours, which makes them a cost-effective choice for both residential and commercial use.