What is the pump

Khemani, H. (2010, Jan 29) What is the pump?
From http://www.brighthub.com/engineering/mechanical/articles/62815.aspx

Summary:
A pump is very important for every house; it is mechanical device that is used for moving of water or oil from a tank. The pumps have different types, such as positive displacement pump and hydraulic vane pumps. Almost every pump has impeller that is located inside the pump or near the fluid. The impeller can drive the water without sucking the fluid.
Positive displacement pump:
The most important type of pumps, it force specific amount of fluid from inlet to pump discharge. Always this type is bigger than other types. It has grater power and enormous pressure to move the fluid. This type has different types, which are reciprocating, metering, and rotary. Rotary uses the rotation for moving the fluid from place to another.
Gear pump:
It consists of number of gears. The gear movement is opposite from each other, and the fluid moves with the movement of the teeth.

Reaction:
The article shows the definition of the pump, the importance of the pumps, the different types of the pump and what the most important type is. I think it has important information about the pump. It is very easy to understand. For example, in my country everybody has a pump in his house, so he or she should know the different type of the pump because it will be easy to buy one in the future.