OverviewThis text is a concise modern introduction to the science of complex networks. The text is based on lectures for university students and non-specialists. The aim of the author is to introduce a reader without serious background in mathematics or physics to the world of networks. The lectures fill the existing gap between popular science books and comprehensive reference volumes on complex networks. The text provides the shortest path to the world of networks, and discusses the main directions of the modern research in this active field as well as the history of network studies. The text describes the current state of the art in complex networks and includes even quite recent results. It will be useful for teaching and self-study.