What is the meaning of Audi A1's engine code 'EA111'?

I've been trying to understand the technical aspects of Audi A1's engines and came across the term 'EA111'. Can someone please explain what this code represents and how it differs from other engine codes?

EA111 stands for 'Entwicklungsarbeit' (development work) and is the designation for Volkswagen Group's series of turbocharged inline-four engines. These engines are often referred to as TFSI (Turbo Fuel Stratified Injection) engines, and have been designed for efficient fuel consumption and low emissions while maintaining high power and torque output.

The 'EA' in 'EA111' stands for 'Entwicklungs Auftrag' (development order) and signifies that this particular engine code was part of a development project within the Volkswagen Group. It is mainly used for gasoline engines and has been in production since 2006.

In simpler terms, EA111 is just a way to identify the specific engine used in an Audi A1. It is similar to the VIN number of a car. Different letters and numbers in the code represent different features and specifications of the engine, such as cylinder capacity, fuel type, and performance.