Charles Darwin developed the theory of evolution by natural selection, which proposes that organisms evolve over generations through a process of natural selection acting on random genetic mutations. Herbert Spencer later applied Darwin's ideas about "survival of the fittest" to human societies, proposing that more advanced societies would dominate less advanced ones, providing justification for imperialism. In contrast, a welfare state is a form of government where the state plays a key role in protecting citizens' economic and social well-being through policies like public services, wealth redistribution, and support for those unable to provide for themselves. While social Darwinism focuses on individuals competing against each other, a welfare state aims to provide for citizens collectively without discrimination.