Ignorance is basicaly the lack of information about something or someone. Often people are racist, prejudiced, and discriminatory towards someone because they lack the correct information about that person. When people don’t know anything about another country or culture, they may believe false ideas and think bad things about all the people of that group even when it is only two or three members of that group that are bad.
The dictionary's definition for ignorance is: "The lack of knowledge or education".