Stereotypes are where people judge other people on where they are from or how they look. Stereotypes can be positive as well as negative.
Here are examples of bad stereotypes:
Teenagers: The stereotype for teenagers is that they are all hoodies, and that they hang around the streets getting up to no good.
Blondes: The stereotype for blondes is that they are dumb.
Irish: The stereotype for the Irish is that they drink a lot.
Here are examples of good stereotypes:
Asians: The stereotype for Asians is that they are good at maths.