This book covers evolutionary games in biology with a focus on classical evolutionary games. The authors first present a brief mathematical introduction for those new to evolutionary game theory and then outline key mathematical developments in order to provide a solid understanding of the fundamentals. Next, the text discusses a range of applications of game theory, introducing the biological problem, the details of the most important models, and the conclusions in each case. Each section relates the games to ones already introduced in the first two mathematical parts of the book.