The theory of general relativity was invented by Albert Einstein. Proposed in 1915, this groundbreaking theory revolutionized our understanding of gravity, suggesting that it is not a force in the traditional sense but rather a curvature of spacetime caused by mass. General relativity contends that massive objects, like planets and stars, bend the fabric of spacetime, which influences the motion of other objects. This theory has been validated by various experiments and observations, such as the bending of light around massive objects and the detection of gravitational waves. General relativity remains a cornerstone of modern physics.