1. The electromagnetic waves are oscillations, which propagate through free space. 2. Em wave travel in free space at the speed of light. 3. Figure shows the simple EM wave, in which the direction of electric field , magnetic field and propagation are mutually perpendicular to each other. 4. The EM waves are transverse in nature i.e. oscillations are perpendicular to the direction of waves so the name transverse electromagnetic waves (TEM).
Diagram:- Transverse electromagnetic wave(TEM)