A light-emitting diode (LED) is a solid-state light source based on a small semiconductor chip encased in plastic.
LEDs have a number of applications in computing, from simple coloured indicators in keyboards and other devices, to backlights illuminating flat-panel screens, to LED lasers seen in DVD drives and fibre-optic communications.
Advantages of LEDs over incandescent light sources include lower energy consumption, longer lifetime, robustness, smaller size, faster switching, and greater durability and reliability.
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