10.1 What is the JDBC 
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Java Database Connectivity (JDBC) is a standard SQL database access interface, providing uniform access to a wide range of relational databases. It also provides a common base on which higher level tools and interfaces can be built.

To talk to a particular type of database all that is required is the correct JDBC drivers. There are several types of JDBC drivers the simplest type are just Java wrappers over native code. The most complex types are written completely in Java which makes the drivers platform independent.

The standard Java VM from Sun microsystems include what is known as the "JDBC to ODBC bridge". This bridge allows the standard ODBC drivers installed on a machine to be used by the Java VM.