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Radio is the wireless transmission of signals, by modulation of electromagnetic waves with frequencies below those of light.

Radio waves

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Radio waves are a form of electromagnetic radiation, created whenever a charged object (in normal radio transmission, an electron) accelerates with a frequency that lies in the radio frequency (RF) portion of the electromagnetic spectrum. In radio, this acceleration is caused by an alternating current in an antenna. Radio frequencies occupy the range from a few tens of hertz to a few hundred gigahertz.

ELF - SLF - ULF/VF - VLF - LF/LW - MW - HF/SW - VHF - UHF - SHF - EHF Electromagnetic radio spectrum

Other types of electromagnetic radiation, with frequencies above the RF range, are infrared, visible light, ultraviolet, X-rays and gamma rays. Since the energy of an individual photon of radio frequency is too low to remove an electron from an atom, radio waves are classified as non-ionizing radiation.
Electromagnetic spectrum and diagram of radio transmission of an audio signal.

Electromagnetic radiation travels (propagates) by means of oscillating electromagnetic fields that pass through the air and the vacuum of space equally well, and does not require a medium of transport (such as the aether). When radio waves pass an electrical conductor, the oscillating electric or magnetic field (depending on the shape of the conductor) induces an alternating current and voltage in the conductor. This can be transformed into audio or other signals that carry information. The word 'radio' is used to describe this phenomenon, and television, radio, radar, and cell phone transmissions are all classed as radio frequency emissions.

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ANW: Tonight on Playboy Radio: Perhaps a look at the other parodies today. http://bit.ly/4tWVGO
adultnewswire (The Adult News Wire) Wed, 06 Jan 2010 01:10:17 -0000
ANW: Tonight on Playboy Radio: Perhaps a look at the other parodies today. http://bit.ly/4tWVGO
They playin Turnt Up on satalite radio...won't be long b4 I hear it in the clubs all the time @LouieTheXIII
cwalkdiamond (c. walker) Wed, 06 Jan 2010 01:10:15 -0000
They playin Turnt Up on satalite radio...won't be long b4 I hear it in the clubs all the time @LouieTheXIII
@berlich yo me voy a bajar ahora la versión que hizo de House of The Rising Sun, la escuché ayer en Radio Nacional.
elmapadelcolo (Colo Mapadelarisa) Wed, 06 Jan 2010 01:10:14 -0000
@berlich yo me voy a bajar ahora la versión que hizo de House of The Rising Sun, la escuché ayer en Radio Nacional.
♪AMNESIA [RADIO REMIX] / CHUMBAWAMBA (2010.1.6 10:08) #nowplaying
RADIOi_Now (RADIOi Now On Air) Wed, 06 Jan 2010 01:10:14 -0000
♪AMNESIA [RADIO REMIX] / CHUMBAWAMBA (2010.1.6 10:08) #nowplaying
NOW PLAYING: Ethnic Music - Japan Summer http://www.quantum-radio.net
rachalmers (Shanghai Bob) Wed, 06 Jan 2010 01:10:13 -0000
NOW PLAYING: Ethnic Music - Japan Summer http://www.quantum-radio.net
Matthew Sapaula's Money Smart Radio – Personal finance and small ...: If money creates money, then wealth must cr... http://bit.ly/7NTV9G
brian0895 (Brian) Wed, 06 Jan 2010 01:10:11 -0000
Matthew Sapaula's Money Smart Radio – Personal finance and small ...: If money creates money, then wealth must cr... http://bit.ly/7NTV9G

 

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ComFM - A directory of all TV and Radio stations you can listen to on Internet
Meta Description: [ Your guide to thousands of Tv and radio stations worldwide made available on the internet in any genre at any time! ... COMFM also provides videos, musical website, and webcams on the internet from all around the world. ]

FMR Radio Web Site - Radio FMR is a local indie Radio station based in Toulouse, France. (89.1 Mhz FM)
Meta Description: [ Radio FMR, Le Site de la Radio Libre Toulousaine - 89.1 MHz - Toulouse - 12h-05h - ]

NRJ Saint Tropez Draguignan - French radio NRJ is mainly listened by teen people. Their Saint-Tropez local station's page gives tips about clubbing in Saint-Tropez.
Meta Description: [ ST-TROPEZ, NRJ Saint Tropez, Actualités des villes du golfe de Saint Tropez. La radio de St Tropez, immobilier Saint Tropez, hotel st tropez, Restaurant Saint Tropez ]

Radio 74 - First English speaking FM radio station in France, rebroadcast by satellite across Europe, the Middle-East and North Africa, as well as by internet.