Photojournalism is the art of telling a story through photography. It is a very interesting field and can have fascinating stories without even needing words. I haven't done any photojournalism on its own, but some of the photos I've taken for my sports articles could be used in part to tell the story of the game on their own, without the need of accompanying writing.
These aren't the greatest photos, but they help tell the story of the game, as they show what is happening.