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Difference between jstl-api and jstl-impl

I am new to Java EE technology. I wonder what the difference is between a bank jstl-apiand a bank jstl-impl.

Why are the API and implementation separated? Does this mean that there are other implementations?

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The API and implementation are separate because Java EE works with a standardized specification.

The API is part of this specification and contains a set of mostly interfaces that all those involved in creating this specification agree with. Theoretically, anyone can implement an implementation that implements a published standardized API and behaves as described in the corresponding specification document. You can call your implementation "certified" when it passes the so-called TCK (Technical Compliance Kit).

This is the stated purpose of this specification system to encourage competition, while any particular implementation is blocked in the same protected form of users.

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