What does an LED stand for?

An LED stands for Light-emitting diode. This refers to a type of semiconductor device that emits light when an electric current passes through it. The functioning of an LED is based on the principle of electroluminescence, where the movement of electrons across the junction of materials in the diode releases energy in the form of light.

This technology is widely used in various applications, including indicators, displays, and lighting, due to its efficiency and longevity compared to traditional incandescent bulbs. The other options do not accurately describe the function or technology of an LED, reflecting misconceptions about its operation.