The document discusses pumps and provides classifications and terminology. It defines a pump as a mechanical device that conveys liquid from one place to another by converting mechanical energy into hydraulic energy. Pumps are classified into positive displacement pumps, which include piston, plunger, diaphragm, reciprocating, gear, lobe, screw and cam pumps, and rotary pumps, which include centrifugal pumps. Terminology discussed includes head, suction head, delivery head, velocity head, static head, water power, shaft power, and efficiency. Reciprocating pumps are described as positive displacement pumps that use moving mechanical elements to physically displace and force out liquid. Reciprocating pumps are classified as single acting, which uses one suction and