Laser stands for Light Amplification by Stimulated Emission of Radiation. Laser is different from natural light as it is coherent, monochromatic and intense. Coherent means that all the waves of the same frequency and do not spread out (spatially and temporally in phase). Monochromatic means the light is of one color and are a precise bandwidth. Intense mean the Laser light delivers the greatest amount of energy per unit area.