Telephone lines typically send and receive blank analog signals which are continuous electronic waves.
Electromagnetic waves, or EM waves, are waves produced by oscillations between electric and magnetic fields. In other words, EM waves consist of oscillating magnetic and electric fields.
Radio waves, television waves, and microwaves are all electromagnetic waves. They only differ in wavelength. Wavelength is the distance from one wave crest to the next.
Electromagnetic waves are produced by the oscillation of electric charges. This vibration creates waves that have both electrical and magnetic components. Electromagnetic waves transport their energy through the vacuum at a velocity of 3.00 x 108 m/s (velocity value commonly denoted by the symbol c).
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