International standards on auditing are like rules that grown-up accountants use to make sure that the numbers they use are correct. Just like how you have to follow the rules when you play a game, accountants have to follow these rules when they check big numbers like money that businesses have.
These rules are made by a group of smart people from around the world who help make sure that everyone playing the game is playing by the same rules. That way, no one can cheat and everyone is using the same measuring stick, like how everyone has to play by the same rules in a game of basketball.
International standards on auditing help accountants check to make sure that the businesses they are looking at are doing the right things with their money. They make sure that the businesses are following the rules and playing the game fairly. This helps keep everything fair and makes things easier for everyone.