External pumps are devices used to move fluids from one location to another, typically outside of a system or equipment. They are commonly found in applications such as aquariums, swimming pools, and industrial processes. These pumps can be powered by electricity, gasoline, or other energy sources, and they come in various types, including centrifugal and positive displacement pumps. One of the main advantages of external pumps is their ability to handle large volumes of fluid efficiently. They are often easier to maintain and replace than internal pumps, as they are accessible and not confined within a system. This makes them a popular choice for both residential and commercial uses.