What is mean by JVM ?

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A Java source code is compiled by java compiler(javac) and converted into the bytecode. This bytecode is then executed by the JVM. A Java Virtual Machine (JVM) is a software program and data structures which use a virtual machine model to execute the instructions.
 JVM accepts accepts the byte code and provides output of that bytecode. 
A bytecode is highly optimized set of instructions.The JVM is combines a set of standard class libraries which implement the Java API (Application Programming Interface).

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