JDK vs JRE vs JVM

JDK
JDK is an acronym for Java Development Kit.  JDK contains every thing that is required to develop and run Java Applications.  

JRE
JRE is an acronym for Java Runtime Environment.  JRE contains everything required to run Java application which has already been compiled.

JVM
JVM is an acronym for Java Virtual Machine, It is a specification that provides runtime environment in which java bytecode can be executed.

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