A prejudice is a prejudgment: i.e. an assumption made about someone or something before having adequate knowledge to be able to do so with guaranteed accuracy. The word prejudice is most commonly used to refer to a preconceived judgment toward a people or a person because of race, social class, gender, ethnicity, age, disability, political beliefs, religion, sexual orientation or other personal characteristics
At times, the terms prejudice and stereotype might be confusing:

  • Stereotypes are generalizations of existing characteristics that reduce complexity. (Wikipedia)

Susan Boyle