Pumps are used to move fluids from one place to another and to add energy needed to overcome the resistance to flow posed by pipes, valves, and nozzles. Pumps are broadly divided into centrifugal and positive displacement types; both are used widely in the food industry. Detailed selection of specific pumps and design of fluid handling systems are typical engineering tasks, but anyone involved in food processing should have some basic understanding of pumps and fluid handling principles.