So you say that communism has never worked

All countries designated as "Communist" are run by Communist parties trying to build towards Communism through Socialism. Communism itself, a global, fully publicly owned economy, has not existed yet, but Socialism, economies where public ownership is the principle aspect of the economy, have.

It is common for people to say "Communism/Socialism" has never worked, and yet not know legitimately what the distinctions are between them.