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'''Radio''' is the [[wireless|wireless transmission of signals]], by [[modulation]] of [[electromagnetic radiation|electromagnetic waves]] with [[frequency|frequencies]] below those of [[light]].

 

''Radio waves'' are a form of electromagnetic radiation, created whenever a [[electric charge|charged]] object (in normal radio transmission, an [[electron]]) [[accelerate]]s 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)|antenna]]. Radio frequencies occupy the range from a few tens of [[hertz]] to a few hundred gigahertz.

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