Rami Arieli: "The Laser Adventure" Chapter 1.2 page 1
1.2 Properties of Laser Radiation

"Ordinary light" (from the sun or lamps) is composed of many different wavelengths, radiating in all directions, and there is no phase relation between the different waves out of the source.

Laser radiation is characterized by certain properties which are not present in other electromagnetic radiation:
1.2.1 Monochromaticity.
1.2.2 Directionality.
1.2.3 Coherence.