The distance from one crest to the next crest in a wave is called the wavelength.
Wavelength is a fundamental characteristic of waves, representing the length of one complete cycle of the wave. It is measured from one peak (crest) to the next peak (crest) or from one trough to the next trough. The wavelength can be impacted by various factors including the type of wave, the medium through which it travels, and its energy. Understanding wavelength is crucial in many fields such as physics, engineering, and even music, as it influences the properties and behavior of waves.