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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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Radio - Twitter Search

Keillor returns to radio after stroke
HaTaMaL_arts (News) Sat, 26 Sep 2009 19:19:29 -0000
Keillor returns to radio after stroke
Wtf i think every word the radio says is lady gaga so i freak out! Im a tard! *Two Rebels*
walterestrada (walterestrada) Sat, 26 Sep 2009 19:19:28 -0000
Wtf i think every word the radio says is lady gaga so i freak out! Im a tard! *Two Rebels*
Listening to "Camera Phone" by Team Randolph http://twiturm.com/ Coming to a radio station near you.. Let's go
special904 (Special Edition) Sat, 26 Sep 2009 19:19:27 -0000
Listening to "Camera Phone" by Team Randolph http://twiturm.com/ Coming to a radio station near you.. Let's go
#mpiii: Digitalism - Rock Da World Radio Podcast - Nov 2008 - Part 2 - #Electro - http://mpiii.com/d-55894
mpiiidotcom (MPIIIdotcom) Sat, 26 Sep 2009 19:19:18 -0000
#mpiii: Digitalism - Rock Da World Radio Podcast - Nov 2008 - Part 2 - #Electro - http://mpiii.com/d-55894
RADIO, VIDEO CHAT, VIRTUAL DRESSING ROOM in this new HOT social network http://aroundtheway.com SIGN UP! #cantlivewithout
minwartz100 (millie) Sat, 26 Sep 2009 19:19:16 -0000
RADIO, VIDEO CHAT, VIRTUAL DRESSING ROOM in this new HOT social network http://aroundtheway.com SIGN UP! #cantlivewithout
Now playing on Bugis Radio: Peterpan - Sebuah Nama Sebuah Cerita CD1 - 12. Kupu Kupu Malam -- http://www.bugis.nl/
bugisradio (Bugis Radio) Sat, 26 Sep 2009 19:19:11 -0000
Now playing on Bugis Radio: Peterpan - Sebuah Nama Sebuah Cerita CD1 - 12. Kupu Kupu Malam -- http://www.bugis.nl/

 

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Aloha2go RadioShow - Current and archived Hawaiian music show, serving to share real Hawaiian music with the world. RealPlayer required for listening.
Meta Description: [ Aloha2go.com podcast hawaiian music Jam sampler - Sponsored by Hawaii's in Las Vegas toll free 1-877-398-1688 ]

Batanga - Featuring over ten online Windows Media Player streams, from rock and pop to Cubanisimo and Tango. Site available in Spanish and English.

Internet Radio Internationale - Online radio station playing music from all around the world 24 hours a day.
Meta Description: [ Xpand your horizons by listening to real reggae on internet radio internationale. ]

KPHI Radio - Featuring music selections from many cultures and styles, including Celtic, German, Polish, Latin, Islamic, Asian, dance, new age and classical.
Meta Description: [ KPHI Multi-Cultural Radio on the Web ]

Omel Web Radio - Music and spoken word online broadcast, featuring soca, reggae and calypso music, plus speeches.

Pacific Islands Radio - Internet radio stations and an overview of the music of the region.

Radio Nova Chicago - Euro and Romanian dance music. RealPlayer, WinAmp, and Windows Media streams available.
Meta Description: [ Radio Nova Chicago ...JUST MORE DANCE... ]

Sisyphus Tracks - Online broadcast offering thematic programs of eclectic roots, folk, Americana and world music, including independent recording artists. Also with reviews, news and related features, information and services.
Meta Description: [ Internet radio station featuring integrated roots music programming served commercial-free via on-demand and live streams. Genres include Americana music, alternative country, folk music, bluegrass, old-time music, blues, roots rock and world. ]

Tempo Italiano with John Richetta - A syndicated radio program of Italian music via RealAudio and live on the air Sundays from 9:00 AM to 3:00 PM on WEST AM 1400, in Easton, Pennsylvania.
Meta Description: [ Tempo Italiano, one of seven weekly radio programs that are produced by Richetta Promotions, can be heard every Sunday on am1400 WEST in Easton, PA from 9A to 3P. ]

Thendral - Tamil Radio - Internet music, entertainment, news and information pertinent to Tamils living in the USA. Requires Windows Media Player.

404 World Song Shop - Weekly program offering a mix of world beat, acoustic and singer/songwriter selections. From 88.3 FM Syracuse.