Gravity is one of the four fundamental forces that rule our world. Except for gravitational all other forces such as electromagnetic force between the electric charges, nuclear force between the atoms, and the weak nuclear force responsible for unstable atoms are governed by quantum theory. Gravity has no properties of quantum theory because gravitation is better explained with the help of relativity theory stated by Albert Einstein. In relativity theory, the subatomic particle’s behaviour is not explained. Therefore, there is no quantum properties related to gravity. But quantum gravity is the new concept that is used for building the relationship between quantum mechanics and gravitation.