Communism (from Latin communis 'common, universal') is a sociopolitical, philosophical, and economic ideology within the socialist movement, whose goal is the creation of a communist society, a socioeconomic order centered on common ownership of the means of production, distribution, and exchange that allocates products in society based on need. A communist society entails the absence of private property and social classes, and ultimately money and the state.

Communists often seek a voluntary state of self-governance but disagree on the means to this end. This reflects a distinction between a libertarian socialist approach of communization, revolutionary spontaneity, and workers' self-management, and an authoritarian socialist, vanguardist, or party-driven approach to establish a socialist state, which is expected to wither away. Communist parties have been described as radical left or far-left. There are many variants of communism, such as anarchist communism, Marxist schools of thought (including Leninism and its offshoots), and religious communism. These ideologies share the analysis that the current order of society stems from the capitalist economic system and mode of production; they believe that there are two major social classes, that the relationship between them is exploitative, and that it can only be resolved through social revolution. The two classes are the proletariat (working class), who make up most of the population and sell their labor power to survive, and the bourgeoisie (owning class), a minority that derives profit from employing the proletariat through private ownership of the means of production. According to this, a communist revolution would put the working class in power, and establish common ownership of property, the primary element in the transformation of society towards a socialist mode of production.

Communism in its modern form grew out of the socialist movement in 19th-century Europe that argued capitalism caused the misery of urban factory workers.