Expansion Diffusion: Expansion diffusion is when a cultural trait or idea spreads from its original location continuously outward to new areas. For example, the popularity of sushi spreading from Japan to other parts of the world.
Hierarchical Diffusion: Hierarchical diffusion occurs when a cultural trait or idea spreads from larger and more influential societies or groups to smaller ones. An example would be fashion trends originating in major cities like New York or Paris and then spreading to smaller towns.
Contagious Diffusion: Contagious diffusion refers to the rapid spread of a cultural trait or idea throughout a population in all directions. An example could be viral videos that quickly become popular worldwide due to social media platforms.