Redlining is a discriminatory practice in which banks and other financial institutions deny services to people living in certain areas, usually based on race or ethnicity. It is also known as 'deleting' and is an illegal form of discrimination. Redlining has been used to deny access to mortgages, insurance, and other financial services to people living in certain neighborhoods. This practice has had a long-term negative impact on communities of color, leading to economic disparities and a lack of access to resources.