The document discusses the concept of marginalization through examining marginalized groups around the world. It defines marginalization as the process by which individuals or groups are excluded based on their identities. Examples provided include non-Arab Sudanese being oppressed in Sudan, over 5 million people affected by conflict in Darfur, one in five Tanzanian girls receiving no education, adolescent girls in Africa facing threats to their human rights, and Indian farmers committing suicide due to debt and economic reforms. Marginalized populations are defined as groups experiencing social exclusion and inequalities.