Why radio frequency is used in communication?

Radio spectrum is used to carry information wirelessly for a vast number of everyday services ranging from television and radio broadcasting, mobile phones and Wi-Fi to communications systems for the emergency services, baby monitors, GPS and radar.

Frequency spectrum of a signal is the range of frequencies contained by a signal .

They can easily cover obstacles in their path and reach their destination due to the large wavelength of the signals . Nowadays, radio communication is used in multiple applications and several fields, including military and commercial use of the radio spectrum.

Frequency bandwidths also are allocated, ranging from 300 hertz for radiotelegraphs to 10 kilohertz for voice-grade radiotelephones to more than 500 megahertz for multichannel digital radio relays in the telephone network to about 850 megahertz for cellular telephones .