A grease gun is a tool used to apply lubricant, typically grease, to machinery and equipment. It helps reduce friction and wear on moving parts, ensuring smooth operation and extending the lifespan of mechanical components. Grease guns come in various types, including manual, pneumatic, and electric, each designed for specific applications. The tool consists of a barrel that holds the grease, a plunger to push the grease out, and a nozzle for precise application. Commonly used in automotive maintenance and industrial settings, grease guns are essential for keeping machinery, such as vehicles and industrial equipment, running efficiently.