What is JVM?

Answer 1

follow: http://www.javatpoint.com/internal-details-of-jvm

Answer 2

Java virtual machine

Answer 3

It is layer between any operating system and java app....which makes the java language to run on multiple devices.

Answer 4

JVM (java virtual machine) it is a part of JRE when source code in java is compiled by compiler it convert into bytecode with .class extension this compiled code is not suitable for computer yet but it is designed to run on JVM which then interpret it into machine language suitable for computer.
jvm is main component of java because due to this only java is portable and architecture independent but jvm is system dependent, any machine that has Jvm installed can run java bytecode(.class)