Blueshift is a phenomenon observed in light waves when an object moves toward an observer. As the object approaches, the wavelengths of the light it emits or reflects become shorter, shifting toward the blue end of the spectrum. This effect is commonly seen in astronomy, where it helps scientists determine the movement of stars and galaxies. In contrast to redshift, which occurs when objects move away and light wavelengths stretch, blueshift indicates a decrease in distance. By analyzing blueshift, astronomers can gather important information about the speed and direction of celestial bodies, enhancing our understanding of the universe.