Imagine you have a lot of toys and you want to organize them so that you can find them easily whenever you want to play with them. You might come up with different ways to organize them, like by color, size, or shape. This is just like how scientists have a lot of chemicals and want to organize them so that they can study and use them easily.
An international chemical identifier (or "InChI" for short) is like a special code for each chemical. This code helps scientists around the world understand exactly what a chemical is, even if they speak different languages or use different names for the chemical.
The InChI has different parts that tell you information about the chemical, like what elements it's made of and how they're arranged. Just like how you might use a code to tell your friend which toy you want them to bring over to play with, scientists can use the InChI code to share information about a chemical with each other.
By having a universal code for chemicals, scientists can communicate more easily about their research and make sure they're all talking about the same chemical. It's kind of like having a secret language to make sure everyone's on the same page.