How would you like to define a stereotype?
Stereotype is a kind of generalization.

Which stereotypes do you know?
I know sterotypes like, "all Jews are greedy", "all Arabs and Muslims are terrorists", "all Russians drink vodka" and "libertarians are pro-drug, pro-abortion and anti-religion".

Do you think it is a problem to believe stereotypes? Why?
Yes, because the stereotypes tend to be oversimplifications.