Overview
Benedict Anderson defined a nation as "an imagined political community - and imagined as both inherently limited and sovereign". An imagined community is different from an actual community because it is not (and, for practical reasons, cannot be) based on everyday face-to-face interaction between its members. Instead, members hold in their minds a mental image of their affinity: for example, the nationhood felt with other members of your nation when your "imagined community" participates in a larger event such as the Olympic Games. As Anderson puts it, a nation "is imagined because the members of even the smallest nation will never know most of their fellow-members, meet them, or even hear of them, yet in the minds of each lives the image of their communion". Members of the community probably will never know each of the other members face to face; However, they may have similar interests or identify as part of the same nation. The media also create imagined communities, through usually targeting a mass audience or generalizing and addressing citizens as the public.
These communities are imagined as both limited and sovereign. They are limited in that nations have "finite, if elastic boundaries, beyond which lie other nations". They are sovereign since no dynastic monarchy can claim authority over them, in the modern period:
...he concept was born in an age in which Enlightenment and Revolution were destroying the legitimacy of the divinely-ordained, hierarchical dynastic realm. Coming to maturity at a stage of human history when even the most devout adherents of any universal religion were inescapably confronted with the living pluralism of such religions, and the allomorphism between each faith's ontological claims and territorial stretch, nations dream of being free, and, if under God, directly so. The gage and emblem of this freedom is the sovereign state. (pp. 6-7)
Even though we may never see anyone in our imagined community, we still know they are there through communication.
Finally, a nation is an imagined community because "regardless of the actual inequality and exploitation that may prevail in each, the nation is always conceived as a deep, horizontal comradeship. Ultimately it is this fraternity that makes it possible, over the past two centuries, for so many millions of people, not so much to kill, as willingly to die for such limited imaginings."
According to Anderson, creation of imagined communities became possible because of "print-capitalism". Capitalist entrepreneurs printed their books and media in the vernacular (instead of exclusive script languages, such as Latin) in order to maximize circulation. As a result, readers speaking various local dialects became able to understand each other, and a common discourse emerged. Anderson argued that the first European nation-states were thus formed around their "national print-languages."
Read more about this topic: Imagined Communities