What is JDK?

JDK (Java Development Kit) is a set of tools for developing applications in Java. It includes:

• javac: Java compiler for converting source code (.java) into bytecode (.class).
• java: Java interpreter for executing the compiled bytecode.
• JAR (Java Archive) tools: Tools for working with JAR files (archives of class files and resources).
• javadoc: Tool for generating API documentation from comments in the source code.
• Debugger (jdb): Tool for finding and fixing errors in the program.
• JRE (Java Runtime Environment): The Java runtime environment necessary to run compiled Java programs. It contains the JVM (Java Virtual Machine) and standard Java class libraries.

JDK is a necessary condition for writing, compiling, and debugging Java applications.