Anarchism is a political theory which aims to create anarchy, "the absence of a master, of a sovereign." [P-J Proudhon, What is Property , p. 264] In other words, anarchism is a political theory which aims to create a society within which individuals freely co-operate together as equals. As such anarchism opposes all forms of hierarchical control - be that control by the state or a capitalist - as harmful to the individual and their individuality as well as unnecessary.

From: An Anarchist FAQ,