Final answer:
Laser is an acronym for light amplification by stimulated emission of radiation, and it refers to a device that emits coherent light. LED stands for light-emitting diode, which is a semiconductor that emits light when electrified.
Step-by-step explanation:
The acronym laser stands for light amplification by stimulated emission of radiation. This sophisticated device emits a stream of coherent, monochromatic photons when electrons in a lasing material transition from a higher energy state to a lower one. Lasers are used in a variety of applications, including medicine, communication, and manufacturing. The first operational laser was developed in 1960, and since then, the technology has evolved to produce different wavelengths for diverse uses.
On the other hand, LED stands for light-emitting diode, a semiconductor device that emits light when an electrical current passes through it. LEDs are used for displays, lighting, and indicators because they are energy-efficient, durable, and offer a range of visible, infrared, and ultraviolet wavelengths. The color of the emitted light depends on the materials used in the semiconductor.