National culture refers to the experiences, beliefs, learned behavior patterns, and values shared by citizens of the same nation.
International culture refers to cultural practices which are common to an identifiable group extending beyond the boundaries of one culture.
Subcultures are identifiable cultural patterns existing within a larger culture.
Cultural practices and artifacts are transmitted through diffusion.
Direct diffusion occurs when members of two or more previously distinct cultures interact with each other.
Indirect diffusion occurs when cultural artifacts or practices are transmitted from one culture to another through an intermediate third (or more) culture.