Okay, kiddo, so imagine you have a piece of glass or plastic. When it's brand new, it's smooth and shiny, right? But sometimes, if you use it a lot or put it under stress, it can start to develop little cracks or lines on the surface. That's called crazing!
It's kind of like when you color really hard with a crayon on a piece of paper, and you can see little lines from the pressure you put on the crayon. But instead of paper, it's happening on a harder material like glass or plastic.
Usually, crazing happens because the material is getting stretched or pulled in different directions. This can happen if you drop something made of plastic, or if you put too much weight on a glass surface. It can also happen over time, if the material is exposed to things like heat, cold, or lots of sunlight.
Crazing might not always be a big problem, but sometimes it can weaken the material and make it more likely to break or shatter. That's why if you see crazing on something important, like a car windshield or a pair of glasses, it's a good idea to get it checked out by a grown-up who knows how to fix it.