An anarchist is someone who rejects the domination of one person or class of people over another. Anarchism is a very broad umbrella term for a group of political philosophies that are based on the idea that we can live as anarchists. We anarchists want a world without nations, governments, capitalism, racism, sexism, homophobia… without any of the numerous, intersecting systems of domination the world bears the weight of today.
There is no single perfect expression of anarchism, because anarchism is a network of ideas instead of a single dogmatic philosophy. And we quite prefer it that way.