What is the difference and relation between a Socialist & a Communist ?

Socialism and communism are ideological doctrines that have many similarities as well as many differences. One point that is frequently raised to distinguish socialism from communism is that socialism generally refers to an economic system, and communism generally refers to both an economic system and a political system. The means of production are publicly owned in both systems, but the ways that money and resources are distributed are different. In socialism, each person is allotted resources according to his or her input, or amount of work, and in communism, each person is allotted resources according to his or her needs. Many people consider communism to be a "higher" or more extreme form of socialism.

As an economic system, socialism seeks to manage the economy through deliberate and collective social control. Communism, however, seeks to manage both the economy and the society by ensuring that property is owned collectively and that control over the distribution of resources is centralized to achieve both classlessness and statelessness. Under communism, all people are considered equal and are provided for equally, regardless of their contributions to the economy or to society. This is different from socialism, but both socialism and communism are similar in that they seek to prevent many of the ill effects that are sometimes associated with capitalism, such as economic inequality.