What do you mean by cavitation in pipe and pump?

Cavitation is the formation of bubbles or cavities in liquid, developed in areas of relatively low pressure around an impeller. The imploding or collapsing of these bubbles trigger intense shockwaves inside the pump, causing significant damage to the impeller and/or the pump housing.

Cavitation of pumps & pipes is the creation of bubbles in the relative low pressure areas  of pipes or pump impellers

cavitation is the formation of bubbles or cavities in liquid, developed in areas of relatively low pressure around an impeller.Cavitation is caused by air bubbles/Cavities in liquid which arised due to improper suction or head.

All pumps are required net positive suction head . If that suction head is below , cavitation is the phenomena that will occurs and will not do the pumping 

• Amount air pocket from some external which entered and can cuase of vibration and impller damaged in pumps called cavitation.