A cathodoluminescence microscope is like a camera that uses very small particles (called electrons) to take pictures of things that are too small to see with our eyes.
Imagine you have a toy that is too small to see with your eyes. If you shine a flashlight on it, you might be able to see it, but only if you look very closely.
The cathodoluminescence microscope works in a similar way. Instead of a flashlight, it shoots a beam of electrons at an object. When the electrons hit the object, they make it glow or light up, just like when you shine a flashlight on something.
The microscope then takes a picture of the glowing object using a special camera. This allows scientists to see very small things that would otherwise be invisible to the naked eye.
So, in summary, a cathodoluminescence microscope is a special camera that uses tiny particles called electrons to take pictures of very small objects that are too small to see with our eyes.