Anarchism is the belief that people can voluntarily cooperate to meet everyone's needs, without bosses or political authority, and without sacrificing individual liberty.
It is the belief that people are able to work together in a peaceful and rational manner, as equals. Instead of a society of individuals competing against one another, some enjoying huge advantages, each only looking after his or her own interests, an anarchist community would be a cooperative effort. This mutual aid or team work does not require great altruisn or self-sacrifice, but simply common decency and helpfulness.