A unit of ammunition is a small but vital component of warfare. Synonyms for this term include bullets, rounds, cartridges, shells, and projectiles. These are all different forms of ammunition that can be used for various weapons. Bullets are a form of ammunition designed for use with firearms. Rounds are typically larger ammunition units, often used with rifles or machine guns. Cartridges are self-contained ammunition units, including the bullet, casing, and primer. Shells are ammunition for larger weapons, such as cannons or artillery guns. Projectiles are ammunition units designed to be fired from a mortar or other type of launcher. Regardless of the term used, the importance of effective and reliable ammunition cannot be understated in the context of warfare.