Prejudice means judging someone without knowing them,on the basis of what they look like or what group they belong to,for example all black people are good dancers.
(source:by Mr Ward's note)
For example :poor people and rich people.Many years ago rich people think poor people are servant ,they don't like these people because they are so poor .They hate poor people,and let poor people do many things what's they don't want to do,some of the rich people hit poor people because they do not do it well.
lt's not right,they are people,too,just poor.They don't have difference to the rich people!!!