Dystopia is a state in which the conditions of human life are extremely bad as from deprivation or oppression or terror.
Dystopian societies are characterised by human misery, oppression, disease, overcrowding, environmental destruction, or war.
Surveillance: It would be all about the control by the government.
Loss of individuality: The concept of individuality disappears in dystopian writing. People are not individuals, they are parts of a whole, expected to conform and obey without question.
Fear of the outside world: Dystopian societies are cut off from the world. They portray the outside world as dangerous and full of unknown horrors.
Dehumanization: Dystopian societies often strip away the humanity of their citizens.