What switches lights in series on and off?

In a series circuit, lights can be switched on and off using a single switch that interrupts the flow of electricity. When the switch is closed, current flows through the circuit, powering all the lights in the series. When the switch is open, it breaks the circuit, stopping the flow of electricity and turning all the lights off. This means that if one light goes out or is removed, it will affect the entire circuit, causing all lights to turn off.