"YA" is a weird category anyway; I'm not sure exactly what it is supposed to mean, but I think in general it refers to books for adults with themes or stories that teenagers might be interested in. The Hunger Games, for example, has *a lot* of violence in it, obviously, and is not for children (the movie was PG-13, but a movie of the book could easily have been R-rated if the producers hadn't toned the violence down a bit). However, the protagonists are in the YA age bracket, and a lot of their concerns are YA-type concerns.
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