Answer:
Dystopia: A futuristic, imagined universe in which oppressive societal control and the illusion of a perfect society are maintained through corporate, bureaucratic, technological, moral, or totalitarian control.
Authors use dystopia as a literary technique to discuss reality and depict issues that might happen in the future. Thus, the role of dystopia in literary works is to educate and give awareness to the audience. Dystopias also serve as warnings about the current state of affairs of a government, or of those in power.