Game Theory is the study of mathematical models of strategic interaction among rational decision-makers. It has found application in the fields of economics, computer science, biology and international relations. This book serves to introduce the principles of non-cooperative game theory - including Nash Equilibrium, Zero-sum Games, Non-zero-sum games, Repeated and Stochastic games, and the Shapely Value in coalition game theory. Selected articles on game theory application in real-life are also included.