Segregation refers to the practice or policy of dividing people into separate groups based on their race, religion, gender, or other defining characteristics. It often involves creating physical barriers or establishing laws and policies that keep different groups separated from one another. Segregation has been used as a tool for oppression and discrimination throughout history, particularly in the context of racial segregation in countries such as South Africa under apartheid. Today, segregation can still be seen in many forms, including residential segregation where people live in separate neighborhoods based on their socioeconomic status or race.