Neutrophils are a type of Phagocyte.

http://en.wikipedia.org/wiki/Neutrophil_granulocyte

Neutrophils are a type of phagocyte and are normally found in the bloodstream.

 During the beginning (acute) phase of inflammation, particularly as a result of bacterial infection, environmental exposure,and some cancers,neutrophils are one of the first-responders of inflammatory cells to migrate towards the site of inflammation.

 They migrate through the blood vessels, then through interstitial tissue, following chemical signals such as Interleukin-8 (IL-8),C5a, fMLP and Leukotriene B4 in a process called chemotaxis. They are the predominant cells in pus, accounting for its whitish/yellowish appearance.

Neutrophils are recruited to the site of injury within minutes following trauma, and are the hallmark of acute inflammation.