Red Shift is a phenomenon observed in light from distant objects in the universe, where the wavelengths of light are stretched, making them appear redder than they actually are. This effect occurs when an object, such as a galaxy, is moving away from the observer. The greater the distance and speed of the object, the more pronounced the red shift. Astronomers use Red Shift to measure how fast galaxies are receding from us, providing evidence for the expansion of the universe. This concept is crucial for understanding the Big Bang theory and the overall dynamics of cosmic evolution.