Have you ever seen a code on the bottom of a glass bottle or jar? That's called a glass code, and it tells us what type of material the glass is made of.
Think of it like this - just like how you can have different colors of Play-Doh, there are different types of glass that can be used for making bottles and jars.
The glass code uses numbers and letters to show us which type of glass it is. For example, if you see the number "1" on the code, that means it's made of a type of glass called PET, which is used for things like soda bottles.
Understanding the glass code can be helpful for recycling because certain types of glass can be recycled more easily than others. By sorting them out, we can give them a better chance of being turned into something new.