Difference between Service Provider Interface (SPI) and Application Programming Interface (API).

An API describes the classes, interfaces, methods that you call and use to achieve a goal while SPI describes the classes,interfaces, methods that you extend and implement to achieve a goal.

In JDBC the Driver class is part of the SPI: If you simply want to use JDBC, you don't need to use it directly, but everyone who implements a JDBC driver must implement that class.

The Connection interface is both SPI and API: You use it routinely when you use a JDBC driver and it needs to be implemented by the developer of the JDBC driver.

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