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The word Radio is defined as the process of sending and receiving messages through the air, using electromagnetic waves.

Radio, Electromagnetic radiation of lower frequency (hence longer wavelength) than visible light or infrared radiation, and consisting of the range of frequencies used for navigation signals, AM and FM broadcasting, television transmissions, cell-phone communications, and various forms of radar.

Radio works by transmitting and receiving electromagnetic waves. The radio signal is an electronic current moving back and forth very quickly. A transmitter radiates this field outward via an antenna; a receiver then picks up the field and translates it to the sounds heard through the radio.

: the wireless transmission and reception of electric impulses or signals by means of electromagnetic waves. b. : the use of these waves for the wireless transmission of electric impulses into which sound is converted. 2. : a radio message.

How To Start a Radio Station in Nine Steps Choose a Broadcast Format. Evaluate the Demand for Your Radio Station. Obtain Funding for Start-Up and Ongoing Costs. Ensure Licensing and Regulatory Compliance. Purchase Necessary Equipment and Studio Setup. Develop Programming for Your Audience. Hire Staff and On-Air Talent.

A short definition for "radio" The first electronic mass medium of communication, involving an audio signal broadcast wirelessly in the form of radio waves from a high-power transmitter to a low-power receiver (radio set). Radio shares many of its representational and institutional characteristics with television.

Radio is the technology of signaling and communicating using radio waves. Radio waves are electromagnetic waves of frequency between 3 hertz (Hz) and 3,000 gigahertz (GHz).