Post-colonial theory is a way of thinking about how different countries have been affected by centuries of colonialism. It looks at how former colonies have been shaped by their relationship with their former colonial rulers, and how colonialism has changed their culture, economics, and politics. It also studies how people in former colonies have responded to colonialism, both in the past and in the present. For example, it might look at how colonialism has led to resistance movements, as well as changes in language, beliefs, or customs. It can also examine how colonialism has impacted later generations, in terms of how racial systems, economies, and social movements have been shaped. In many ways, post-colonial theory examines how people in the world have been impacted by colonialism and its legacy.