Final answer:
Prejudice is a negative attitude towards an individual based on their membership in a social group. Its harmful effects can be reduced through education, contact, building relationships with different cultural groups, and creating inclusive environments.
Step-by-step explanation:
Prejudice is a negative attitude and feeling towards an individual based solely on their membership in a particular social group. To reduce its harmful effects, education, contact, interactions, and building relationships with members of different cultural groups are important. Imagining positive interactions with someone from a different group can also lead to a more positive attitude. Additionally, strategies like working together towards common goals and creating inclusive environments can help decrease prejudicial attitudes.