The theory of relativity created by Albert Einstein is interrelated to special relativity and general relativtiy. Special relativity applies to everything in the absence of gravity while general relativity explaining the law of gravitation and the relation to forces of nature. The theory changed theoretical physics and astronomy and superseding the theory of mechanics created by Isaac Newton. Introduction the ideas of 4-dimensional spacetime as a combined entity of space and time. The Theory also improved the science of elementary particles and their foundational interations, as well as guiding the nuclear age. It predicted the insane astronomical phenomena like neutron stars, black holes, and gravitational waves.