Unlike white light, the laser light is monochromatic, that is to say, it contains only one color. In this case, the photons have the same wavelength and move in the same direction as the laser light at the same frequency. This light is called coherent because all these parameters are identical. Temporal coherence is called because it is sustainable over time, in fact a laser will keep these property in time and space.
In those pictures we can see that emission laser have coherent specter comparing to emission from usual sources.
The laser light is not visible in nature, it can only be created. Einstein was the first who theorized this principle. The light can be stimulated if you change these settings. The laser light is the propagation of an electromagnetic wave with the scattered photons moving in the same direction and the same speed.