Okay kiddo, so imagine you have a really cool toy car that you can drive all around. Now imagine that your toy car is actually made up of tiny little balls that are all glued together, kind of like a big ball made up of a bunch of smaller balls.
Well, scientists have found a way to make something like that but with light! Yes, you read that right, they made a toy car out of light - well, kind of. They used something called polaritons, which are like particles that are made up of both light and matter.
Now when they made these polaritons, they noticed something really cool. If they put enough of them together, they started to act like a superfluid. A superfluid is kind of like a liquid that can flow without any resistance, kind of like water flowing down a drain.
So basically, these polaritons, which are made up of light and matter, act like a superfluid and flow really smoothly without any resistance. Cool, huh? It's like having a really fancy toy car that drives itself without any bumps in the road. Scientists think that this could be really useful for making new kinds of electronics or even for studying the way light and matter interact with each other.