What is OBD in Audi A2 vehicles?

I am looking to understand what OBD is and how it is used in Audi A2 vehicles. Can someone explain it in simple terms?

OBD has been a mandatory requirement in all vehicles since the 1990s. Audi A2 vehicles use OBD-II, which is an improved version of the original system and provides more detailed information about the vehicle's performance and emissions.

OBD stands for On-Board Diagnostics and it is used to monitor and control the performance of various vehicle systems. It can identify issues and potential problems before they become bigger and more expensive. For example, if the OBD detects an issue with the engine, it will trigger a warning light on your dashboard so you can address the problem before it worsens.

In Audi A2 cars, OBD is a standardized system that allows technicians to access information about the vehicle's performance and health. This information can be used to diagnose issues and make repairs more efficiently.