Diffusion is the process by which something spreads from one place or individual to others. The document discusses three main types of diffusion: expansion diffusion which occurs when something spreads from one core location to others nearby in a hierarchical, contagious, or stimulus-driven manner, and relocation diffusion which involves the movement of people or ideas over longer distances.

1. Diffusion
Ms. Patten
2012

2. Definition

3. Types of Diffusion

4. Expansion Diffusion

5. Expansion: Hierarchical

6. Expansion: Contagious

7. Expansion: Stimulus

8. Relocation Diffusion