Bulletproof glass, also known as ballistic glass or transparent armor, is a type of strong, thick glass that is designed to be resistant to bullets and other projectiles. It is typically made by layering two or more sheets of regular glass with a thin, flexible sheet of plastic (such as polycarbonate) in between them. This creates a durable barrier that can absorb the impact of a bullet without shattering, making it an effective protection against gunfire. The term "bulletproof" refers to the ability of the material to withstand being hit by a projectile, such as a bullet or other high-speed object, without breaking apart or allowing penetration.