Laser stands for Light Amplification by the Simulated Emission or Radiation. Lasers beams are rays of light of great intensity and absolute purity. Unlike other ordinary rays of light, laser beams exist at a single wavelength and can be reflected by carefully positioned mirrors so that the beam does not spread out. Lasers are also coherent meaning that when the light emerges from its source, the beams are almost parallel.
Lasers are usually thought of as being futuristic: only used in science or as part of something in 'outer space', but lasers are everywhere nowadays. …
