"Geodesics in Lorentzian Manifolds" is a specialized book that deals with the theory of geodesics on Lorentzian manifolds. It provides a comprehensive analysis of the properties of geodesics in various geometric contexts, particularly regarding the differences between Riemannian and pseudo-Riemannian manifolds. The book addresses the concepts of geodesic completeness and the different types of geodesics that occur in Lorentzian manifolds, including temporal, spatial, and null geodesics. The author, Amir Botros, explains the mathematical foundations and theoretical implications of these concepts, making it a valuable resource for students and professionals in the fields of mathematics and natural sciences. Its clear structure and precise explanations make it a useful reference for anyone interested in the geometry of manifolds.