What is laminated glass?

Laminated glass, or lami, is made up of two panes of glass with a plastic interlayer. The glass panes can be tempered or annealed. Visually it looks like a single piece of glass, but the plastic adds an additional layer of protection.

The windshield of your car is laminated glass. If the windshield gets a crack, it stays in place because of the interlayer. The same is true if someone tries to throw a brick through a laminated glass window. It’s not an impenetrable barrier, but it can be enough to deter a would be intruder and it will at the very least slow them down.