Diffusion of Culture

Culture is contagious, that is customs,belief,tools,techiniques,folktales,ornaments and so on. These elements may diffuse from one people or region to another. To be sure, a culture trait must offer some advantage, some utility or pleasure to be sought and accepted by people.
The degree of isolation of a sociocultural system brought up by " physical barriers" such as deserts, mountains ranges and bodies of water has an important bearing upon the ease or difficulty of diffusion. (Tobacco,coffee, the sweet potato are examples of diffusion).