Endogamy and exogamy are two types of marriage practices that are found in different cultures around the world. Here are the key points about each:

Endogamy

• Endogamy is the practice of marrying within ones social group, community, tribe, or class.
• It is a customary practice that has been followed around the world to maintain social status and uniqueness.
• Inbreeding is considered dangerous, and endogamy can lead to genetic defects.
• Endogamy can be rigid, with the leader of the parents of the tribe having the only authority to choose the groom or bride.

Exogamy

• Exogamy is the practice of marrying outside ones social group, community, tribe, or class.
• It is usually defined through kinship rather than ethnicity, religion, or class.
• Exogamy is most common among groups that reckon descent through either the father (patrilineality) or the mother (matrilineality) alone.
• The severity of enforcement of exogamous restrictions varies greatly across cultures and may range from death to mild disapproval.
• Marrying a member of ones own clan or moiety typically constitutes a form of incest.

In summary, endogamy is the practice of marrying within ones social group, while exogamy is the practice of marrying outside ones social group. Both practices have been followed around the world and have different cultural and social implications.