Einstein's General Theory of Relativity is a fundamental theory in physics that describes how gravity affects the fabric of space and time. Proposed by Albert Einstein in 1915, it suggests that massive objects, like planets and stars, warp the space around them, causing other objects to move along curved paths. This explains why planets orbit stars and why light bends around massive objects. The theory revolutionized our understanding of gravity, moving away from the traditional view established by Isaac Newton. It has been confirmed through various experiments and observations, such as the bending of light during a solar eclipse and the detection of gravitational waves, further solidifying its importance in modern physics.