JDBC stands for Java Database connectivity. It's an API which helps Java based applications to interact with RDBMS using SQL and PL/SQL. JDBC is part of specification and defined the interfaces. The implementation is provided by the jdbc vendors. For example you will use a different JDBC driver for connecting to Oracle and DB2. However if you are writing your code against the JDBC base interfaces, the program is guarenteed to run against both the databased by just switching the implementation.
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