According to the textbook; "Prejudice is a rigid and unfair generalization about an entire category of people" (Prentice-Hall, p. 284, 2006). In other words prejudice is basically a prejudgment about people before having any adequate knowledge of the people in question; such as being against a race, social class of people, someone's gender, even their ethnicity, it could be anything. Some people are even prejudice over being homeless, being elderly or disabled, even over people who are obese, plus there is religious prejudice as well as sexual orientation.
What is Race is defined as classification of humans as well as being defined by ethnicity. Ethnicity is basically classified as people who can identify with each other, through their common heritage. Both of these words are identifiable through many of the same things such as common language or religion but are not limited to these things. To fully understand race and ethnicity people refer to groups of people who have differences and similarities in biological traits deemed by society to be socially significant. Ethnicity refers to the shared cultural practices of the people within that race as well as within the region they come from.
Racial /Ethnic Prejudice affects people as well as populations all over the United States as well as throughout other countries. In other words it is like an infectious disease that spreads like wild fire. According to the Popular Issues website "It is diagnosed by the cataloguing of its various symptoms and manifestations which include fear, intolerance, preparation, segregation, discrimination, and hatred" (Racial Prejudice-Discrimination 2002-2011). There is one main underlying cause of someone being prejudice and that is complete ignorance. Unfortunately this is a growing social disease because if there are differences there will always be fear as well as intolerance and major injustice.