So, once upon a time, some people who love money, called bankers, were playing with so much money that they sometimes forgot that it was not their own money. Do you know what happens when we forget things? We make mistakes, and sometimes those mistakes cost a lot of money. Now, if too many bankers make too many mistakes, then a lot of people will lose their money, and that's not good. That's why some smart people got together and created something called the Basel Accord.
This Accord is like a set of rules or guidelines that bankers must follow when they want to play with other people's money. It helps all the bankers to avoid making too many mistakes and protects the people who have given their money to the bankers to play with.
This Accord is like a game with rules. Imagine there is a game where you have to build a tower with blocks. You can't just take any block and put it up, right? There has to be a rule to check that you are following the right way to build the tower. The same thing happens with the bankers. They can't just take whatever money they want and invest it wherever they want. They have to follow some rules to make sure they are safe.
So, basically, the Basel Accord is just a set of rules that bankers need to follow. The rules help them not to make mistakes and protect people's money. It's like a big game of money, and the rules need to be followed so that everyone can win!