Ok kiddo, so there's a big meeting that happens every few years where smart people from all over the world come together to talk about how tiny particles like photons, electrons, and atoms collide with each other.
You know how when two toy cars crash into each other, they make a big noise and sometimes get damaged? Well, when tiny particles like those I mentioned crash into each other, something different happens. It's a bit like a puzzle, because scientists don't always know what the outcome will be.
So, the meeting is called the "International Conference on Photonic, Electronic and Atomic Collisions" because it's all about those tiny particles and how they bump into each other. People who go to the meeting will show off their latest discoveries and ideas to make science better.
There might be scientists talking about how to make better lasers, or how to build new materials from atoms. There might be people talking about how to make the internet faster using new electronics.
It's a lot of exciting stuff, and the smart people who go to the meeting really work hard to make the world a better place using science.