A pump is a device that moves fluids, often using pressurized air or steam. The two types of pumps are positive displacement and centrifugal. Positive displacement pumps include plunger-type pumps and piston-type pumps, while centrifugal pumps work by forcing the fluid to spin around a central axis. There are many different types of pumps for many different applications, so it's important to know what type of pump you need before purchasing one.
