The bulb will not glow.

In this circuit, switch is open that is circuit is broken, so the bulb will not glow. Switch helps to complete or break the circuit as it breaks the circuit when it is on "OFF" mode but it completes the circuit when it is on "ON" mode, hence the switch help us to use the electricity use as per our requirement. Which happen because as there is an air gap between its terminal when it is open or on "OFF' mode.