Einstein's General Relativity is a theory that explains how gravity works. Instead of thinking of gravity as a force pulling objects together, Einstein proposed that massive objects, like Earth or the Sun, bend the fabric of space and time around them. This bending creates a sort of "valley" that smaller objects, like the Moon or satellites, follow, which we perceive as gravitational attraction. This theory revolutionized our understanding of the universe. It helps explain phenomena such as the orbit of Mercury around the Sun and the bending of light from distant stars when it passes near massive objects. Overall, General Relativity has reshaped modern physics and our view of the cosmos.