I assume you're asking about a car water pump. Inside of the pump casing is an impeller (a disc or wheel with vanes). The impeller is connected to a shaft that's connected to a pulley wheel driven by the drive belt from another pulley wheel mounted on the engine shaft. The pump, the radiator and the hoses make up a water filled, enclosed system. As the pump rotates when the engine is running, it circulates the water around the system removing heat from the engine and giving up the heat to the atmosphere through the radiator. ....
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Water pumps can be positive displacement or impeller type. Either of these increases the pressure of the water and so can move or lift the water. Centrifugal is an impeller type where a sort of fan blows the water. If the fan stops the water can flow back. You'll need to prime these if they get dry. Fishtanks might use this. Positive displacement means that the water is pushed by some sort of piston. Diaphragm pumps are positive displacement and useful if you don't want the water to run back. Also you won't need to prime it because won't drop the water out when it stops. I'm not sure where hydraulic ram type pumps come into this scheme but they rely on the inertia of moving water to generate high pressure pulses to pump water.
