Discrimination is the behavior or actions, usually negative, towards an individual or group of people, especially on the basis of sex/race/social class, etc.
When we judge people and groups based on our prejudices and stereotypes and treat them differently, we are engaging in discrimination. This discrimination can take many forms. We may create subtle or overt pressures which will discourage persons of certain minority groups from living in a neighborhood. Women and minorities have been victimized by discrimination in employment, education, and social services. We may shy away from people with a history of mental illness because we are afraid they may harm us. Women and minorities are often excluded from high echelon positions in the business world. Many clubs have restrictive membership policies which do not permit Jews, African-Americans, women, and others to join.