ISO 6438 is a special code that helps people understand things better when they are using machines or computers. It's like a secret language that helps machines communicate with each other.
Just like how we use letters and numbers to write words and sentences, machines use certain codes to talk to each other. For example, when you press a button on your computer, it sends a code to the machine that tells it what to do.
ISO 6438 is a specific code that is used to help with communication between machines. It was created by a group of people who wanted to make sure that machines from different countries could communicate with each other easily.
So, if you ever use a machine that needs ISO 6438, you'll know that it's just a little bit of code that helps the machine understand what to do. It's like a secret language that only machines understand!