Rotary pumps are mechanical devices used to move fluids by trapping a fixed amount of liquid and forcing it through the pump's outlet. They operate using rotating elements, such as gears or vanes, which create a vacuum that draws in the fluid. This type of pump is commonly used in various applications, including automotive systems, industrial processes, and hydraulic machinery. These pumps are known for their ability to handle high-viscosity fluids and provide a steady flow rate. They can be powered by electric motors or engines and are often chosen for their efficiency and reliability in transferring liquids like oil, water, and chemicals.