When your application creates or uses large amounts of data, it’s usually necessary for that information to be stored in a database. Although there has been significant growth in the use of NoSQL databases in recent years, the most widely used type of database is still a relational database, and some examples of relational database products are Oracle, DB2, Sybase, MySQL, and Microsoft SQL Server. A relational database product is sometimes referred to as a relational database management system (RDBMS, or simply DBMS), while a database usually refers to a collection of data managed by a DBMS.