Why we call Thread.start() method which in turns calls run method?

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[…] why not we directly call run() method?

The run() method is just an ordinary method (overridden by you). As with any other ordinary method and calling it directly will cause the current thread to execute run().

All magic happens inside start(). The start() method will cause the JVM to spawn a new thread and make the newly spawned thread execute run().

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