The Java Development Kit (JDK) is a developer kit for the Java language that includes everything necessary for writing, compiling, and running Java programs. The JDK includes:

The javac compiler for converting source code into bytecode.
The Java Runtime Environment (JRE) for running programs.
Standard Java libraries.
Tools for debugging and profiling.

Without the JDK, it is impossible to create and run a Java application, making it a fundamental tool for any Java developer.

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