The International Organization for Standardization (ISO) is like a club where many countries from around the world join together to agree on how things should be done. Just like how you and your friends might make rules for playing a game, these countries make rules for doing things like making products or providing services.
Each country in this club has a say in the rules, and they all work together to make sure these rules are fair and useful. They also make sure that everyone keeps following the same rules so that products and services are the same quality no matter which country they come from.
Being part of this club means that countries agree to follow the same way of doing things, which can make things a lot easier when it comes to trading goods and services. It's like speaking the same language even if you come from different parts of the world!