Thrown explosive

A thrown explosive is a type of weapon that has existed in some shape or form in every Fallout game.

Fallout, Fallout 2
In Fallout and Fallout 2, thrown explosives are governed by the Throwing skill.

Fallout 3
In Fallout 3, thrown explosives are moved into their own skill category, Explosives, including also the Dynamite and Plastic explosives from Traps.

Fallout: New Vegas
In Fallout: New Vegas, thrown explosives are still governed by the Explosives skill. The Explosives skill in general is broadened to also include "explosive"-style guns, but extra traits and perks are included that help differentiate thrown explosives from other explosive weapons.

Related weapons
Fallout: New Vegas Thrown Explosive weapons, 2