Rimfire ammunition is a type of cartridge used in firearms, where the primer compound is located within the rim of the casing. This design differs from centerfire cartridges, where the primer is in the center. Rimfire rounds are commonly utilized in smaller caliber firearms such as .22 rifles and handguns. They are known for their affordability, simplicity, and low recoil, making them popular choices for target shooting, plinking, and small game hunting. However, due to their construction, rimfire cartridges cannot be reloaded like centerfire cartridges.