Electromagnetic radiation consists of waves of the electromagnetic field, propagating through space, carrying electromagnetic radiant energy. It includes radio waves, microwaves, infrared, light, ultraviolet, X-rays, and gamma rays. All of these waves form part of the electromagnetic spectrum.
Electromagnetic waves, or EM waves, are resultant vibrations that are made of vibrations between an electric field and a magnetic field.
In other words, electromagnetic waves are made up of oscillating magnetic and electric fields.
An electromagnetic wave's electric and magnetic fields are perpendicular (at right angles) to each other. They are also perpendicular to the EM wave's direction.