Redlining refers to a discriminatory practice in the United States where banks, insurance companies, and government agencies refused or limited financial services to certain neighborhoods based on their racial or ethnic composition. This practice was prevalent during the 1930s to the 1970s and disproportionately affected African American and other minority communities. Redlining led to disinvestment, segregation, and disparities in wealth and opportunity within cities. Today, there is ongoing research on the impact of redlining on urban development, economic inequality, and racial disparities in the United States. Researchers also study strategies to address the legacy of redlining and promote equitable access to financial services and resources for marginalized communities.