Java Development Kit (JDK) is a software development kit that is used to develop Java applications. It includes a set of tools and libraries that are needed to compile, run, and debug Java programs.

The JDK includes the following components:

• The Java Runtime Environment (JRE), which is the runtime environment that is needed to run Java programs.
• The Java compiler, which is used to compile Java source code into bytecode that can be executed by the JRE.
• The Java debugger, which is used to debug Java programs by finding and fixing errors.
• The Java documentation generator, which is used to generate API documentation from Java source code.
• The Java launcher, which is used to start Java applications from the command line.

To develop Java applications, you will need to install the JDK on your computer. You can download the JDK from the Oracle website:

• Java Development Kit: https://www.oracle.com/java/technologies/javase-downloads.html

Once you have installed the JDK, you can use a text editor or an Integrated Development Environment (IDE) such as Eclipse or IntelliJ IDEA to write and edit your Java code. You can then use the Java compiler and debugger included in the JDK to compile and run your Java programs.

For more information on the JDK and how to use it to develop Java applications, you can refer to the Java documentation:

• Java Development Kit: https://docs.oracle.com/en/java/javase/11/docs/specs/jdk/index.html
• Java Development Kit Installation: https://docs.oracle.com/en/java/javase/11/install/index.html