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The theory of relativity, developed by Albert Einstein, consists of the special and general theories. Special relativity introduces the concept that space and time are interwoven into a single continuum called spacetime, and that the laws of physics are the same for all non-accelerating observers. General relativity extends this concept to include gravity, describing it as the curvature of spacetime caused by mass. This theory has revolutionized our understanding by showing that time can dilate and lengths can contract depending on relative speeds and gravitational fields