In music, a radio edit is a modification to make a song more suitable for airplay, whether it be adjusted for length, profanity, subject matter, instrumentation, or form. Radio edits may also be used for commercial single versions, which may be denoted as the 7" version.

Radio edits often shorten a lengthen a song to make it more commercially viable for radio stations. The normal length for songs played on the radio is 3 to 4 minutes. Occasionally, the song will simply fade out earlier, common on tracks with long instrumental endings. For instance, the radio edit of 'Heroes' by David Bowie fades in shortly before the beginning of the third verse and fades out shortly before the vocal vamping at the end of the song. However, many radio edits will also edit out verses, bridges, and interludes, such as the original single edit of "Piano Man" by Billy Joel which substitutes the end of the third verse for the ending of the second verse.

Some songs will be remixed heavily and feature different arrangements than the original longer versions, occasionally even being completely different recordings. A popular example of this would be "Revolution" by The Beatles which is a completely different recording than the version which appears on The White Album. This also became more prevalent with the rise of the 12" record, as artists like New Order started making songs specifically for the format. Many of the 7" mixes aimed for pop radio airplay of their songs feature very different arrangements, such as "Bizarre Love Triangle", or even a completely different recording, such as "Temptation".

Radio is the transmission of signals through free space by electromagnetic waves with frequencies significantly below visible light, in the radio frequency range, from about 3 kHz to 300 GHz. These waves are called radio waves. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space.

Information, such as sound, is carried 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.

The etymology of "radio" or "radiotelegraphy" reveals that it was called "wireless telegraphy," which was shortened to "wireless" in Britain. The prefix radio- in the sense of wireless transmission, was first recorded in the word radioconductor, a description provided by the French physicist Édouard Branly in 1897. It is based on the verb to radiate (in Latin "radius" means "spoke of a wheel, beam of light, ray").

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