Social Darwinism is a sociological theory that applies the concept of 'survival of the fittest' from Charles Darwin's theory of evolution to human societies. This ideology suggests that individuals or groups achieve success due to inherent superiority and justifies social inequalities by framing them as natural outcomes of competition. Social Darwinism has influenced various social policies and attitudes, particularly in the context of Naturalism, where it reinforces themes of determinism and the struggle for survival against societal and environmental forces.