Packing seals are essential components used in various machinery and equipment to prevent leaks of fluids or gases. They are typically made from materials like rubber, plastic, or metal and are designed to fit snugly between two surfaces, creating a barrier that keeps substances contained. These seals are commonly found in applications such as pumps, valves, and engines, where they help maintain pressure and protect against contamination. Proper installation and maintenance of packing seals are crucial for ensuring the efficiency and longevity of the equipment they are used in.