This document summarizes key concepts in sociological understanding of race and ethnicity. It discusses the myths of race and contrasts race with ethnicity. It also covers minority and dominant groups, prejudice and discrimination, theories of prejudice, and patterns of intergroup relations globally and within the US, including for European Americans, Latinos, African Americans, Asian Americans, and Native Americans. It concludes by discussing the future of immigration, affirmative action, and a multicultural society in the US.