What is known as NPSH and why is it important in pump selection?

I prefer that the candidate have multiple session of interaction. The screened and selected candidate should be interviewed by the concerned department head in first sessionand should be forwarded to HR for completion of formalities of documents and remuneration negotiations.

NPSH Stands for Net Positive Suction Head.

http://www.engineeringtoolbox.com/npsh-net-positive-suction-head-d_634.html