Polarization (also polarisation) is a property of waves that can oscillate with more than one orientation. Electromagnetic waves such as light exhibit polarization, as do some other types of wave, such as gravitational waves. Sound waves in a gas or liquid do not exhibit polarization, since the oscillation is always in the direction the wave travels.
Polarized Light
Vibrations lie on one single plane only.
Unpolarized Light
Superposition of many beams, in the same direction of propagation, but each with random polarization.