Armor plates are protective materials designed to absorb and deflect impacts from projectiles, such as bullets or shrapnel. They are commonly used in military and law enforcement applications, as well as in personal protective equipment like vests. Armor plates can be made from various materials, including steel, ceramic, and polyethylene, each offering different levels of protection and weight. These plates are often inserted into tactical vests or worn as standalone body armor. The effectiveness of armor plates is measured by standards set by organizations like the National Institute of Justice (NIJ), which classifies them based on their ability to withstand specific types of ammunition.