The classical optimal control theory deals with the determination of an optimal control that optimizes the criterion subject to the dynamic constraint expressing the evolution of the system state under the influence of control variables. If this is extended to the case criteria (payoff function) it is possible to begin to explore differential games. Zero-sum differential games, also called differential games of pursuit, constitute the most developed part of differential games and are rigorously investigated. In this book, the full theory of differential games of pursuit with complete and partial information is developed. Numerous concrete pursuit-evasion games are solved ("life-line" game, simple pursuit games, etc) and new time-consistent optimality principles in the n-person differential game theory are introduced and investigated.