JVM, JRE, JDK, IDE

 

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JVM - Java Virtual Machine. It converts byte code to binary code. The JVM has two primary functions: to allow Java programs to run on any device or operating system, and to manage and optimize program memory.

          JRE - Java Runtime Environment. It is a software layer that runs on top of a computer's operating system software and provides the class libraries and other resources that a specific Java program needs to run. 

        JDK - Java Development Kit. JDK comprises java compiler, JRE and JVM.