DriverManager : this fully implemented class was introduced in the original JDBC 1.0 API. When an application first attempts to connect to a data source by specifying a URL, DriverManager will automatically load any JDBC drivers found within the CLASSPATH (any drivers that are pre-JDBC 4.0 must be explicitly loaded by the application).
Connectivity using JDBC Driver
1) JDBC DriverManager provides the application with a connection to a database via Connection object
2) JDBC DriverManager provides the application with a connection to the database via a Connection object.
3) JDBC Driver collects and translates the database response, routing it back to the application.