The European Banking Union is like a big piggy bank where all the countries in Europe put their money in to keep it safe. Just like when you put your money in your piggy bank to keep it safe, countries put their money in too.
The purpose of the Banking Union is to make sure that all the banks in Europe are safe and stable, so that people can trust them with their money. If a bank in a country gets in trouble and can't pay back its customers, then the Banking Union can help out and make sure that people still get their money back.
The Banking Union has 2 parts: the Single Supervisory Mechanism (SSM) and the Single Resolution Mechanism (SRM). The SSM is like a supervisor who checks on all the banks in Europe and makes sure they're doing things the right way. The SRM is like a firefighter who comes to the rescue if a bank gets in trouble and needs help.
Having a Banking Union makes it easier for countries to work together and helps to prevent financial crisis. It also helps to build trust between countries and create a stronger European economy.