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What is JRE, JVM, and JDK?

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Difference between JRE, JVM, and JDK By ANONYO SANYAL Now, this article lays a foundation to learn the internals of a JVM. To do that first we need to understand JRE, JVM and JDK and their differences. Once you are done click here to learn the internal details of JVM JVM:- Firstly JVM stands for Java Virtual Machine.  Secondly, JVM is an abstract machine i.e. it doesn't exist in reality. It is just an abstract concept. It is the detailed description of the design and materials which provides a runtime environment to run the java bytecode .  Funny fact, we all know java is a platform independent programming language. But do you know that JVM, JRE, and JDK are platform dependent? The reason is pretty clear. we said that JVM gives a specification (detailed description of the design and materials) for the runtime environment to run the java bytecode. But the specification changes from one Operating System to another. Now to make Java a platfo...