Why does the Audi A3 have two fuel pumps?

I've noticed that the Audi A3 has both a high-pressure and a low-pressure fuel pump. Why is this necessary and how do they work together?

The reason for the two fuel pumps is to ensure proper fuel pressure at all times. The low-pressure pump is responsible for transferring fuel from the tank to the high-pressure pump, which then delivers the fuel to the engine. This design allows for better fuel efficiency and performance.