ELI5: Explain Like I'm 5

Klyne–Prelog system

Imagine you have a bunch of toys that all look a little different from each other. Some might be bigger, some might be smaller, some might be rounder, and some might be square. But you want to be able to talk about them with your friends and make sure they understand which toy you're talking about.

The klyne-prelog system is kind of like a code for naming different molecules, which are basically just really teeny tiny toys called atoms stuck together. Just like you might use words like "big" or "round" to describe your toys, scientists use parts of the klyne-prelog system to describe different parts of molecules.

Each molecule is made up of different atoms, which are kind of like the letters in a word. Each atom has a different shape, and scientists use the klyne-prelog system to describe those shapes. One part of the system works like an instruction manual, telling scientists which shape should be considered "big" and which should be considered "small." Another part of the system uses letters to describe the shape of the molecule as a whole, which is like putting all the letters together to make a word.

So, just like you and your friends might say "That's the big, red car!", scientists use the klyne-prelog system to say things like "That's the molecule with the big, round atom and the small, square atom." By using this system, they can communicate about molecules more easily and make sure everyone is on the same page.