In todays era, to store huge amount of data, File Management System is not convenient way. So this book focuses on the concepts of DBMS. Database is a collection of related data and data is a collection of facts and figures that can be processed to produce information. A database management system stores data in such a way that it becomes easier to retrieve, manipulate, and produce information. This book covers the basics of DBMS, Different Data Models, Transactions, Concurrency Control, Advanced Databases and practical aspects of SQL.