What is the role of the choke valve in an Audi 80 engine?

I am trying to understand the function and purpose of the choke valve in an Audi 80 engine. Can someone please explain it to me in simple terms?

The choke valve is responsible for regulating the air and fuel mixture in your engine during start-up. It controls the amount of air that flows into the carburetor, helping the engine start smoothly. My advice is to make sure the valve is clean and functioning properly to avoid any starting issues.