This document discusses different types of marriage across cultures from an anthropological perspective. It begins by asking questions about how marriage is defined and regulated and what role it plays in creating group alliances. It then defines key concepts like exogamy, incest taboos, and different types of cousins. The document also discusses why incest is nearly universally taboo, types of marriage like endogamy and homogamy, and marriages in caste systems. It concludes by briefly covering divorce and polygamy.