What is the difference between socialism and statism?

Statism: the principle or policy of concentrating extensive economic, political, and related controls in the state at the cost of individual liberty.

Socialism: An economic system in which the production and distribution of goods are controlled substantially by the government rather than by private enterprise

Socialism is mostly economic and Statism is both economic and political. All Socialists are Statists but not all Statists are Socialist (Case in point: Iran, Statist but not officially Socialist)