A pump moves fluids, such as liquids and gases by mechanical action. Pumps can be classified into three major groups, direct lift, displacement, and gravity pumps. Pumps operate by a rotary mechanism and consume energy to perform mechanical work by moving the fluid. Pumps operate via many energy sources, including manual operation, electricity, engines or wind power. Pumps are used for irrigation, water supply, gasoline supply, air conditioning systems, refrigeration, sewage movement, flood control, marine services, etc. pumps come in a variety of shapes and sizes, from very large to very small, from handling gas to handling liquid, from high pressure to low pressure, and from high volume to low volume.