A subtle distinction

Communism is a political/economic system and socialism is an economic system. Here is a decent essay on the subject.

The core belief of all socialists is that human beings thrive or die depending on their social relations. As such, socialists believe that our actions are shaped by our social structures, not by an inherent human nature or individual choices. [...] The core belief of all socialists is that human beings thrive or die depending on their social relations. As such, socialists believe that our actions are shaped by our social structures, not by an inherent human nature or individual choices. [...] Communists ... advocated an all-powerful state, in which a central government wields total control over its people - the economy, the media, industry, education, etc. This is contrary to many socialists who believe that control of these things should belong to people on a de-centralized local level, rather than a centralized national level.