The book is intended to provide basses of Einstein relativity theory : Special and general for introductory course detail in the following concepts : History of Einstein Special Relativity Theory, Departures from Newtonian Dynamics, Perplexities in the Propagation of Light, Galileo Transformations, The Postulates of Einstein, Lorentz Coordination Transformation, The Lorentz and Einstein Coordinate, Relativistic of length and time Measurements, Relativistic Space-Time Measurements, Relativistic Velocity Transformations, Relativistic of Mass , Energy and Momentum , Relativistic Kinematics, Relativistic Dynamics: Collisions and Conservation Laws, Relativity and Electricity, Relativistic Doppler Effect, Applications of Special relativity, Einstein General Relativity, and Einstein's Thought Experiments . the book is intended to be compatible in level and style of treatment. The book is designed to be reasonably self-contained and usable as an individual component in many different courses structure undergraduate and advance.