The textbook discusses the basic concepts of classical game theory in a simple and accessible form and presents its applications in the practice of decision-making. Particular attention is paid to the logic of game-theoretic analysis of economic situations that require quantitative justification of decisions. The considered game models and methods of their research, including logical and mathematical apparatus, have distinct and understandable economic applications for undergraduate students. Meets the requirements of the federal state educational standards of higher education of the latest generation. It is addressed to undergraduate students of economic and managerial fields who need to get acquainted with the basic concepts of game theory, but it can be useful to students of other fields of study, as well as to anyone who has a lack of competence in the field of decision-making techniques and methods.