Armor-piercing refers to ammunition designed to penetrate armor or protective barriers. This type of ammunition typically features a hardened core made from materials like tungsten or steel, allowing it to effectively breach the protective layers of vehicles, body armor, or fortifications. The effectiveness of armor-piercing rounds is often measured by their ability to defeat specific levels of protection, such as those found in military vehicles or body armor. These rounds are commonly used in military and law enforcement applications, where overcoming defensive measures is crucial for mission success.