It has everything the JRE has, but adds the compiler (javac) and tools (like javadoc and jdb).

The Java Development Kit (JDK) is the full-featured software development kit for Java developers. JRE cannot be used to create new programs. The JRE software package includes the Java Virtual Machine (JVM), the Java Class Library, the Java command, and other infrastructure. The Java Runtime Environment or JRE contains everything required to run Java applications on your system. Examples of applications that use Java are numerous and widespread but include web browsers, office applications and even mainstream games like Minecraft are based on Java. Java is a programming language and software platform. The new license permits certain uses, such as personal use and development use, at no cost – but other uses authorized under prior Oracle JDK licenses may no longer be available. The new Oracle Technology Network License Agreement for Oracle Java SE is substantially different from prior Oracle JDK licenses. Also, you should know that some applications might refer to Java 8 as version 1.8.0. Oracle plans to maintain it until at least 2030. Java 8 is the last free software public update for commercial use, which explains why it remains popular. You can download the version you need below: Java 8, Java 11 and Java 17 are the three long-term support versions recommended by Oracle. However, many versions of Java are actively maintained for compatibility purposes. The latest version of Java is Java 20 or JDK 20 released on March, 2023. Why would you need the JDK then? Because the application server will convert JSP into Java servlets and needs to use the JDK to compile the servlets. For example, if you are deploying a web application with JSP, you are technically just running Java programs inside the application server. Sometimes, even if you are not planning to do any Java development on a computer, you still need the JDK installed.

It is capable of creating and compiling programs.

It has everything the JRE has, but also the compiler (javac) and tools (like javadoc and jdb). The JDK is the Java Development Kit, the full-featured SDK for Java.

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