Dystopian literature is a genre of fictional writing used to explore social and political structures in ‘a dark, nightmare world.' The term dystopia is defined as a society characterized by poverty, squalor or oppression and the theme is most commonly used in science fiction and speculative fiction genres.
https://www.questia.com/library/literature/literary-themes-and-topics/dystopian-literature
Dystopian fiction is set is new or alternative worlds, or futuristic societies and is characterised by degradation in values, social hierarchy, terror and oppression. These titles often include elements of science fiction, conflict and romance. The Hunger Games trilogy by Suzanne Collins, The Maze runner series by James Dashner and are great examples.
http://schools.natlib.govt.nz/creating-readers/genres-and-read-alouds/genres-young-adult-and-young-fiction