Answer:
A stereotype is a belief that someone / something is a specific way. Usually stereotypes are seen as offensive, but good stereotypes exist as well.
Step-by-step explanation:
For example, if I were to say something like "all Americans are violent", that'd be a negative stereotype because not all Americans are violent. But if I were to say "all Americans are hard-working", that'd be a good stereotype because being hard-working is a good personality trait.