what is the practice of exogamy?

Exogamy is the practice of marrying or forming a partnership outside one's own social or ethnic group. It is a cultural norm and social practice that encourages individuals to seek a spouse or partner from a different community, culture, clan, or social group. This practice is common in many societies globally and serves various purposes, including forging alliances, strengthening social relationships, promoting diversity, avoiding inbreeding, and expanding social networks. Exogamy plays a significant role in shaping kinship systems, marriage patterns, and the overall structure of societies.

VERY short sentance

Exogamy is the practice of marrying outside one's own group.