Aesthetics

1.  Most news photographs are either candid images of events or posed images like portraits, but not as worried about making the subject look good as snapshots or traditional portraits.  It's about trying to portray the truth, or the truth that the newspaper wants to show.

2. Snapshots also portray what is, though usually a personal memory not an important event.  They are usually light-hearted with little or no thought put into the formal issues of the photograph.

3.  All sorts of fashion, ads, and product photography are trying to sell you something.  They create a world that their product is the center of and make it seem as if it's a necessary item.  They are normally very focused on the product, highlighting is good points.

4.  These are also creating another world, whatever world the movie is making.  The exact aesthetics vary dramatically from the different genres of movie, but it normally focuses on an important or interesting moment in the movie.

5.  Yearbook or senior photos are for the sole purpose of remembering a person.  Because of this they are very focused on the person and their different aspects.  It's often, though not always, a plain or unfocused background to place emphasis on the figure, which they try to make look as good as possible.