Ah, you want a textbook definition, do ya?

Communism (from Latin communis, 'common, universal') is a left-wing to far-left sociopolitical, philosophical, and economic ideology within the socialist movement, whose goal is the creation of a communist society, a socioeconomic order centered around common ownership of the means of production, distribution, and exchange that allocates products to everyone in the society based on need.

I went ahead and put a relevant section in bold.