The JRE does not contain tools and utilities such as compilers or debuggers for developing applets and applications. It is also the foundation for the technologies in the Java 2 Platform, Enterprise Edition (J2EE) for enterprise software development and deployment. ![]() In addition, two key deployment technologies are part of the JRE: Java Plug-in, which enables applets to run in popular browsers and Java Web Start, which deploys standalone applications over a network. The Java Runtime Environment (JRE) provides the libraries, the Java Virtual Machine, and other components to run applets and applications written in the Java programming language. To explain the difference between JDK and JRE, the best is to read the Oracle documentation and consult the diagram : Indeed there are specific implementations of the JVM for different systems (Windows, Linux, MacOS, see the wikipedia list.), the aim is that with the same bytecodes they all give the same results. It's also the entity that allows Java to be a "portable language" (write once, run anywhere). The JVM doesn't understand Java source code, that's why you compile your *.java files to obtain *.class files that contain the bytecodes understandable by the JVM. The Java Virtual Machine (JVM) is the virtual machine that run the Java bytecodes. ![]() In other words if you are a Java programmer you will need JDK in your system and this package will include JRE and JVM as well but if you are normal user who like to play online games then you will only need JRE and this package will not have JDK in it. JVM = Class loader system + runtime data area + Execution Engine. JRE = JVM + Java Packages Classes(like util, math, lang, awt,swing etc)+runtime libraries. In layman terms: JDK is grandfather JRE is father and JVM is their son. These files allow the standard library to be used with jlink.
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