Cyclodiphosphazane is a big and fancy sounding word that describes a molecule made up of phosphorus and nitrogen atoms. Imagine you have a bunch of Legos (the atoms) and you can put them together in different ways to make different shapes (molecules). Cyclodiphosphazane is one of the shapes you can make!
It's called "cyclo" because it's a ring shape, like a ring that you wear on your finger. And "diphosphazane" means that there are two phosphorus atoms and two nitrogen atoms in the shape.
Scientists have looked at this molecule a lot because it has some very cool properties. It can be used to make things like plastics, which we use every day in things like water bottles and toys. And, if you add certain other molecules to it, the cyclodiphosphazane can even be used to help deliver medicine to specific parts of the body where it is needed!
But don't worry if you don't understand all of that quite yet. Just remember that cyclodiphosphazane is a shape made up of atoms and it can be used to make lots of cool things that we use every day.