I been wondering the same, as in some ways they are the same, except for a couple of parts.
Socialism Vs Communism
" Socialism is the idea that the working class, the class that produces the profits, the wealth, the cars, houses, planes, steel, should take over and run things collectively, democratically, for the benefit of the majority (who also "just happen" to be workers too).
Communism is the idea that society should not have classes - exploiters and exploited, oppressors and oppressed, and so on. "
Socialism generally refers to an economic system, while communism refers to both an economic and political system.
Socialism seeks to manage the economy through deliberate and collective social control.
Communism seeks to manage both the economy and the society by ensuring that property is owned collectively, and that control over the distribution of property is centralized in order to achieve both classlessness and statelessness.
Both socialism and communism are based on the principle that the goods and services produced in an economy should be owned publicly, and controlled and planned by a centralized organization. Socialism says that the distribution should take place according to the amount of an individual's production efforts, whilst communism asserts that that goods and services should be distributed among the populace according to individuals' needs.