Wavelength refers to the distance between crests of a wave, commonly seen in the context of electromagnetic radiation such as light or radio waves. It is often used to describe the color or frequency of light, with shorter wavelengths corresponding to higher frequencies and vice versa. Understanding the concept of wavelength is crucial in various fields such as physics, astronomy, and telecommunications, as it plays a significant role in determining the properties and behavior of waves. Researchers in this area study the relationship between wavelength and other wave characteristics, as well as its practical applications in technology and science.