Well, anarchism is, in my view, basically a kind of tendency in human thought which shows up in different forms in different circumstances, and has some leading characteristics. Primarily it is a tendency that is suspicious and skeptical of domination, authority, and hierarchy. It seeks structures of hierarchy and domination in human life over the whole range, extending from, say, patriarchal families to, say, imperial systems, and it asks whether those systems are justified. It assumes that the burden of proof for anyone in a position of power and authority lies on them. Their authority is not self-justifying. They have to give a reason for it, a justification. And if they can’t justify that authority and power and control, which is the usual case, then the authority ought to be dismantled and replaced by something more free and just. And, as I understand it, anarchy is just that tendency. It takes different forms at different times.
This is from an interview with NOAM CHOMSKY — ‘Everyday Anarchist’: The Modern Success Interview