Redshifts in astronomy refer to the increase in the wavelength of light emitted by celestial objects as they move away from Earth. This phenomenon is a result of the expanding universe and is a key indicator of the distance and velocity of galaxies and other cosmic objects. By studying redshifts, astronomers can determine the age, size, and composition of the universe, as well as track the movement and evolution of galaxies over time. Additionally, redshifts play a crucial role in the development of the theory of the Big Bang and our understanding of the structure and dynamics of the universe.