Diodes can be used to protect electronic components from current flowing in another direction. Describe another application outside of electronics where it would be important for something to flow in only one direction.

A diode is a discrete component that allows current to flow in one direction only. It is a polarised component with two leads. Aside from being used in electronics, it is also used in public facilities. Traffic lights, scoreboards, and vending machines are examples of diode-dependent devices.