This document discusses social and spatial segregation. It defines geographical segregation as when population proportions are not evenly distributed throughout a space. Segregation can occur along dimensions like gender, religion, ethnicity, etc. Social segregation is often measured using indices to quantify differences in exposure between groups. Segregation can be caused by both direct government policies as well as indirect social and economic factors that create segregated neighborhoods over time. The analysis of segregation looks at how differentiated populations are distributed across social locations and the processes that create and maintain this distribution.