Communism is a revolutionary socialist movement to create a classless, moneyless, and stateless social order structured upon common ownership of the means of production.
Marxist theory holds that pure communism or full communism is a specific stage of historical development that inevitably emerges from the development of the productive forces that leads to a superabundance of material wealth.
The theory claims this can be accomplished by creating an all-consuming dictatorship with ownership and control over all society. No real-world example has ever existed to prove it ever progresses beyond this point.