no future for virtual keyboard

advantages of virtual keyboard?

The specific arrangement of keys on a keyboard is a separate issue, from whether you are using physical keys or virtual keys. The virtual keyboard is an alternative to the actual keyboard, not to the QWERTY keyboard.

tell me whole working of virtual keyboard

A virtual keyboard differs from a touch typing keyboard because a virtual keyboard is on touch sensitive screen (like on the iphone) rather a hardware keyboard that some people prefer.