A theoretical economic system characterized by the collective ownership of property and by the organization of labor for the common advantage of all members.
A system of government in which the state plans and controls the economy and a single, often authoritarian party holds power, claiming to make progress toward a higher social order in which all goods are equally shared by the people.
1 is "real communism." Everyone owns everything (to an extent. Despite assertions to the contrary, there is still private property in communist thought. No, nobody wants to collectivize your towels), everyone has a job, everyone has all needs met and exceeded. Healthcare, transportation, tacos, whatever you need is covered.
2 is what we've seen in the real world because dictators gonna dictate. A group of individuals will get to the "we're in charge and can really do a communism this time!" step and immediately go "but it's kinda cool being an asshole and living in a fuckin' palace, you know?" and BOOM, STALIN.
"Real communism" is something that has actually, literally, never been achieved because it devolves into a dictatorship.
Meanwhile, all captalism devolves into oligarchies but people are fine with that because... reasons?