Bulletproof vests, also known as ballistic vests, are protective garments designed to absorb and reduce the impact from projectiles, such as bullets. They are commonly worn by law enforcement officers, military personnel, and security professionals to enhance their safety in dangerous situations. These vests are made from layers of strong materials, like Kevlar or polyethylene, which help to disperse the energy of a bullet upon impact. The effectiveness of a bulletproof vest is rated based on the level of protection it offers, which is determined by standards set by organizations like the National Institute of Justice. While no vest can guarantee complete protection, wearing one significantly increases the chances of survival in a shooting incident.