Utopia and Dystopia

Utopia
The term comes from novel by Thomas More which offered a description of a fictive ideal society based around notions of equality, social harmony, economic prosperity and political stability. More’s Utopia was a completely planned community based upon controlling individual impulses that could be destructive to the public good.  Private property is unknown, everyone wears the same clothes so there’s no envy of wealth or social status, and there’s no pretext for avoiding work; there are no bars or places that might corrupt people and no hiding places or any place where “secret meetings” could be held; at the same time, there’s no poverty, hunger, violence or other social problems that were common to More’s time and still are today.
The word “utopia” is a combination of two Greek words, and literally means “no place”; when pronounced in Latin, however, it means “good place.”  The combination of these two meanings informs the way we currently view the word now: utopia is a place that is essentially fictive—that doesn’t exist in our world—and also an ideal place, that we can create.
The utopian idea has been enduring but problematic.  The part of More’s vision that really stuck in the cultural imagination is the notion of equality, harmony, and prosperity.

 Dystopia
In its most basic sense, you could say that dystopia is the opposite of utopia, referring to fictional societies that are incredibly imperfect, lacking the harmonious and egalitarian qualities of life depicted in utopias.  But it’s not exactly opposite, in that dystopias often contain many of the same elements as utopias—such as intense measures of social control—but these elements are taken to horrific extremes, with emphasis upon their negative effects.  The term has been around since the 19th century; it was coined by English philosopher and economist John Stuart Mill in 1868; but as a genre of fiction, it really took off in the 20th century and became very prevalent in the years after World War II.
Dystopian literature is a subset of the larger category of anti-Utopian literature, which generally satirizes Utopian thinking; dystopian literature stands out from other anti-utopian writing in that it doesn’t just say what’s wrong with utopian models of society, but offers an alternate view of social potentialities.  Dystopian fictions are fundamentally concerned with problems of the political and cultural context that produces them; For example, George Orwell’s 1984, one of the most famous dystopian novels, was written in 1949, shortly after World War II and the rise of totalitarian states on the right and the left, such as Nazi Germany and the Soviet Union under Stalin; it’s not surprising then that Orwell would depict Big Brother and the Thought Police, elements of a profoundly oppressive state bent on maintaining absolute control over individuals (including even their thoughts).
Like utopian writing, there is often a prescriptive element—Dystopian fictions almost always offer some kind of warning of what will happen should present trends continue.