EM waves are defined as a propagating couple of an electric and magnetic field components whereby the electric and magnetic field vectors include an angle of 90 degree in the media we commonly find in POFs.
Electromagnetic waves or "EM" waves are waves that are created as a result of vibration between an electric field and a magnetic field.
Explanation:
EM waves are formed from-when an electric field is in contact or in near with/a magnetic field. If both parties have occurred, hence electromagnetic wave is produced.
