Radio

Radio is the radiation (wireless transmission) of electromagnetic signals through the atmosphere or free space.

The primary use of radio waves is to carry information, such as sound, by systematically changing (modulating) some property of the radiated waves, such as their amplitude, frequency, phase, or pulse width.

When radio waves strike an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information in the waves can be extracted and transformed back into its original form.

External Links

• Radio @ Wikipedia