In this talk we will introduce basic Game Theory, through some simple examples. The seminar is directed toward general audience and undergraduate students. People playing games for pleasure or to adopt an strategy for real world problems. Game Theory has some powerful application in the real world. It is used in modelling in ecology, evolution, economics, behavioral sciences, political sciences, radio and radar jamming, war, etc. The origin of game theory is not well-known. Since ancient times, any cultures and nations have used game theory for joy or in decision making in many different setting. Formal Game Theory began in 1944 with the Theory of Games and Economic Behavior, by John Von Neumann and Oscar Morgenstern. John F. Nash made some major contribution to Game Theory. Many other people have contributed to the development of Game Theory.