A multicultural curriculum recognizes and values diversity by integrating the histories and cultures of all groups in a society into the courses of study. It aims to help students understand cultural differences and similarities, appreciate diverse groups, and function effectively across cultures. Experts believe a multicultural curriculum is important given increasing diversity in the US population. For schools to foster multiculturalism, they must reflect diversity in staff, policies, instructional materials, extracurricular activities, and integrate multicultural content throughout the curriculum rather than in isolated units. Effective professional development is also needed to help staff examine biases and increase cultural knowledge and competency.