A hollow-point bullet is a type of ammunition designed with a hollowed-out tip. This design allows the bullet to expand upon impact, creating a larger wound channel. This expansion can increase the bullet's effectiveness in stopping a target, making it popular for self-defense and law enforcement use. Hollow-point bullets are often contrasted with full metal jacket (FMJ) bullets, which do not expand and are designed for penetration. The use of hollow-point ammunition is subject to regulations in some areas, as its effectiveness can raise concerns about over-penetration and collateral damage in populated areas.