Social Darwinist ideologies are beliefs that apply the concept of 'survival of the fittest' from Charles Darwin's theory of evolution to human societies, suggesting that certain groups are naturally superior and more successful than others. This perspective was used to justify social inequality, imperialism, and racism, arguing that stronger nations and races were entitled to dominate weaker ones. Such ideologies emerged in the late 19th century, heavily influencing social policies and practices across Europe and beyond.