Photojournalism

photojournalism
fəʊtəʊˈdʒəːn(ə)lɪz(ə)m/
noun
  1. the practice of communicating news by photographs, especially in magazines.

In my opinion:
A form of art that advances our understanding of the situation using photography. The photos add more information and knowledge to the situation instead of just confirming our current understanding. 
Examples like these:

Same of my favorites:

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