What is the work of JDK in Java?

To run the JDK installer:

When you install the JDK, or the Java Development Kit, you are installing everything that the JRE has, but you are also installing the compiler javac , which is capable of compiling Java programs . These compiled Java programs can then be run in the Java Runtime Environment.

The JDK is a development environment for building applications, applets, and components using the Java programming language . The JDK includes tools useful for developing and testing programs written in the Java programming language and running on the Java platform.

The Java Development Kit (JDK) is a distribution of Java Technology by Oracle Corporation. It implements the Java Language Specification (JLS) and the Java Virtual Machine Specification (JVMS) and provides the Standard Edition (SE) of the Java Application Programming Interface (API) .