When two societies meet, neither stays exactly the same. Acculturation describes the changes that flow from sustained contact: new words enter a language, foods appear on the table, and ideas about everything from marriage to money begin to shift. The direction of influence is rarely equal. A group with more political power or economic reach tends to shape the exchange, though the weaker partner is not simply passive. People borrow selectively, adapting what they take to fit their own needs.

Anthropologists have long distinguished acculturation from assimilation. In acculturation, a group may adopt new traits while keeping its own identity intact. Assimilation goes further, absorbing a minority into the dominant culture until the original distinctiveness fades. The distinction matters in practice. Immigrant communities, for instance, often blend new customs with old ones across generations without disappearing.

Common patterns

• Trade, migration, and conquest are the usual engines of contact.
• Borrowing moves in both directions, but rarely at equal speed.
• Material culture changes faster than deep values or beliefs.
• Younger generations typically adopt new traits before their elders.

Studying acculturation helps explain why cultures are never static. The process can be gradual or forced, peaceful or violent, and its outcomes depend on who holds power.