The Theory of Relativity refers to the physics theory proposed by Albert Einstein. This theory has significant scientific importance as it provides a foundation of modern physics and has led to numerous technological breakthroughs. Synonyms for this theory include the relativity theory, the special theory of relativity, and the general theory of relativity. The relativity theory suggests that the laws of physics appear identical to all observers, regardless of their position and motion. This theory also proposes that the speed of light remains constant in a vacuum. The general theory of relativity additionally suggests that gravity arises due to the curvature of spacetime by massive objects.