What was social Darwinism and how it affected people's views on imperialism?

Social Darwinism i like the evolution of humans. It states that the most fittest will continue to survive and reproduce, like survival of the fittest. I guess the effect of it on Imperialism is that people want to be on top so they tried to conquer all they could to get all the valuables in those places they've conquered and so they can be the fittest.