Rotary seals are sealing elements used to prevent the leakage of liquids or gases from rotating shafts or axles. They are also known as shaft seals and are often used in machines and systems that have rotating components, such as pumps, motors and gearboxes. A rotary seal consists of a usually elastic sealing lip that fits tightly to the rotating shaft and thus prevents media from passing through or escaping the shaft. The sealing lip can be made of different materials such as rubber, plastic or metal, depending on the requirements of the application. In addition to their primary function as a seal, rotary seals can also help lubricate the shaft by keeping lubricant near the sealing surface. They can also be equipped with various functions such as wear indicators or temperature sensors to monitor and optimize the operation of the system.