In this book, Einstein shares his excitement after completing The General Theory of Relativity when he was not yet well-known outside physics institutes. The purpose of this book, as explained by the author himself, is "to give an exact insight into the Theory of Relativity to those readers who from a general scientific and philosophical point of view are interested in the theory, but who are not conversant with the mathematical apparatus of theoretical physics. Einstein explained his theory of relativity using minimal math. This book explains the special and general theory of relativity in simple language and how it led to a new theory of gravity.