Albert Einstein was the first scientist to propose the theory of relativity. Its significance lines in revolutionizing our understanding of space, time, and gravity. The theory introduced concepts like the constancy of the speed of light and the relativity of simultaneity. Einstein's general theory of relativity extended these principles to include gravity, explaining it as the curvature of space time caused by mass and energy. The theory made predictions that were later confirmed, resolving inconsistencies with Newtonian physics. Its impact on modern physics is immense, shaping our understanding of the universe and finding applications in cosmology, practical physics, and astrophysics.