The article discusses how the European Central Bank's monetary policy has changed over 20 years since the Euro was introduced. It looks at how the bank's approach has shifted from a strict one to a more flexible one, similar to other central banks. The study analyzes how the bank responded to economic situations and how the main economic indicators of the twelve founding countries have changed during this time. The main finding is that the ECB's monetary policy has evolved towards a more practical and adaptable approach.