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Bulletproof glass is composed of alternating layers of polycarbonate, such as Lexan, and glass laminated together. The glass layers allow better transparency than plastic alone, while the plastic ensures damage reduction and shatter resistance. The installation may be damaged enough to break the glass but the lamination ensures that it retains its original form.
There is currently no truly unbreakable glass.
A very common use of unbreakable glass in video games is to show the player character a scene, while keeping the player from interacting with it. It is usually a more visceral and emotional method of conveying these scenes than through video screens.
Another use is to temporarily or permanently forbid a player from entering an area, sometimes requiring a story character to destroy the "unbreakable" glass before allowing the player to continue.