An inflator is a device used to fill objects with air or gas, commonly used for inflating items like tires, balloons, and sports equipment. It can be powered manually, electrically, or through compressed gas, making it versatile for various applications. Inflators come in different types, including hand pumps, electric pumps, and CO2 inflators. Each type serves specific needs, such as quick inflation for bicycles or air mattresses. Proper use of an inflator ensures that items maintain their shape and function effectively.