Socialism, social democracy, and communism all focus on a more egalitarian distribution of wealth and income. To what extent and what their approaches are, differ, though.

Social democracy proposes a classless society, usually within the premise of an ‘electoral democracy’.

Socialism, if distinguished from social democracy, also wishes a classless society, but goes further: it wishes to advance social ownership of the economy, i.e. rather than just politics, the economy is also democratised. Instead of a CEO deciding for all, it’s the labourers that choose, that have a say.

Communism proposes that a just society must be not just classless, but also moneyless and stateless. Instead of money as transferrable and susceptible to wealth accumulation, other means for exchange are used; labour vouchers, community exchange systems, and so on. Instead of a centralised, repressive state, society would be decentralised and free, living in communes; if there is a military or a police, both should stand on equal footing with the people.