How does culture spread?

There are several ways by which culture can spread from one place to another. Mostly spreading of culture is attributed to cultural diffusion. WHen a person from one culture mixes with the people of another culture then there is a high probability that the culture of both the people will slowly merge. They both will start accepting the culture of one another. Culture can also spread during trading, marriage etc between two countries. people of the both the countries will come to know about the culture of each other and accept some parts of it. During this modern age, technology has also played a role in the spreading of culture to various places lying far away.