Answer / vatsal doshi

JVM is actually a virtual machine, which operates at one level of abstraction above the actual platform.

Platform = OS + Underlying Hardware

Now, Java compiled code(byte code) is targetted to run on JVM, independent of underlying actual platform.

So, Java code written on windows can be directly run on linux/mac/solaris, without recompilation, provided JVM is installed in the target machine.

We have different implementations of JVM for different platforms. The advantage is that though JVM is platform dependent, but the compiled code now becomes platform independent.

Answer / bala

each OS has its own configuration for external resources
like connecting to a network accessing external memory, RMI
etc, so each OS has its own JVM to achieve this...

Answer / venkat

jvm is used to convert into an machinery language

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