Discrete geometry investigates combinatorial properties of configurations of geometric objects. Its development in recent years has been stimulated by applications in combinatorial optimization and computational geometry. To a working mathematician or computer scientist, it offers sophisticated results and techniques of great diversity. This book is primarily a textbook introduction to various areas of discrete geometry. In each area, it explains several key results and techniques, in an accessible and concrete manner. The book also contains more advanced material in separate sections and thus it can also serve as a collection of up-to-date surveys in