A fragmentation grenade (commonly known as frag or frag grenade) is an anti-personnel weapon that is designed to disperse small projectiles or fragments on detonation. The body may be made of hard plastic or steel. The outer casing and/or a fragmentation matrix consisting of notched wire and preformed fragments (spherical or otherwise) provide the projectiles. When the word grenade is used without specification, and context does not suggest otherwise, it is generally assumed to refer to a fragmentation grenade.

A hand grenade is any small bomb that can be thrown by hand. A variety of hand grenades exist, the most common being explosive grenades designed to detonate after impact or after a set amount of time.