The knowledge of database systems is an important part of education in Computer Science. Without database, an organisation is blind. The book 'Introduction to Database Management System' introduces concepts, designs, applications and technologies of database in a very comprehensive manner. It assumes no previous knowledge of databases and database technology. The book is self-contained. The chapters are written in a very simple language with a lot of examples and exercises. The book also contains a large number of figures to explain the concepts in a better way. It will serve as a textbook in databases for both undergraduate (B.E., B.Tech, B.C.A., B.Sc.) and postgraduate (M.Sc., ME, M.Tech, M.C.A.) students. The book fills in the gap between theoretical learning and practical implementation of concepts of databases for IT professionals and engineers.