I NTRODUCTION • Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field. In other words, EM waves are composed of oscillating magnetic and electric fields. Electromagnetic waves are formed when an electric field comes in contact with a magnetic field. They are hence known as 'electromagnetic' waves. EM waves are a special type of wave that can travel without a medium. Unlike sound waves and water waves, electromagnetic waves don't need a fluid, or a solid, or even air to help them travel from one place to another. EM waves can travel across the great vacuum of space. Most EM waves are invisible to the eye but detectable. APPLICATION/IMPORTANCE/ADVANTAGES/DANGERS • Electromagnetic waves can be split into a range of frequencies. This is known as the electromagnetic spectrum. Waves in the EM spectrum include the following