What is the purpose of the bypass valve on the Audi 80 turbocharger?

I recently came across this term while browsing Audi forums and I'm curious about its function in the turbocharging system. Can someone explain it to me in simple terms?

The bypass valve, also known as the wastegate, is a crucial component in controlling the boost pressure in your Audi 80's turbocharger. This valve diverts excess exhaust gas away from the turbine wheel, preventing it from spinning too fast and potentially damaging the engine. Make sure to have it inspected regularly to ensure proper function.

The bypass valve essentially acts as a pressure relief valve for your turbocharger. When the engine reaches a certain level of boost, the valve opens to release excess pressure and maintain optimum performance. It's important to keep an eye on the valve for signs of wear and tear and have it replaced if necessary.