For the first time in history, the physical nature of gravity is truly understood. For centuries people have asked "what exactly is gravity?" Today we have an answer. This elegant and simple model will be presented in this book. // All concepts are explained in simple language, with intuitive analogies, and several illustrations. The concepts are presented easily easy enough for any curious reader to understand. In fact, I have explained these concepts with success to high school students, and to people with limited English proficiency. // The concepts of Gravity Strings also lead us to the Unified Field Theory, and to the Theory of Everything. These solutions have also been published by this Author. //