What does bullet penetration mean?

Bullet penetration refers to the depth and effectiveness with which a bullet can pierce through materials, such as skin, tissue, or armor. It is influenced by various factors, including the bullet's design, caliber, velocity, and the material being penetrated. In firearms and ballistics studies, understanding penetration is crucial for evaluating the stopping power and lethality of different ammunition types. Higher penetration can lead to greater damage to vital organs or incapacitation in self-defense situations.