Dystopian societies are characterized by oppressive governments, lack of individual freedoms, and harsh living conditions for citizens. Common themes in dystopian works include the use of technology, surveillance, propaganda, and control to oppress populations. Dystopian protagonists typically feel trapped in these societies and want to escape or expose the true nature of the dystopian world to readers. Examples of popular dystopian books include The Hunger Games, Divergent, and Fahrenheit 451.