Wavelengths refer to the distance between consecutive peaks or troughs in a wave, commonly associated with light and sound. In the context of electromagnetic waves, such as those produced by the sun or radio transmitters, wavelengths determine the type of radiation, ranging from radio waves to gamma rays. In sound waves, wavelengths influence the pitch of the sound we hear. Shorter wavelengths produce higher pitches, while longer wavelengths result in lower pitches. Understanding wavelengths is essential in fields like physics, music, and communication technology.