People use the term Communism (both upper-case and lower-case) in various ways nowadays, but Marx’s original ideal form of society was "From each according to his ability, to each according to his needs" The ultimate goal is to create an affluent productive society that can provide all amenities for all people, so they can unleash their potentials as individuals without being enslaved by capitalists as wage workers just to survive. And socialism is only an intermediate step before realizing this ideal state, socialism wasn’t intended to be ideal even for the leftists (In this sense communism has never been tried anywhere yet).