Trade Routes: Networks established for the exchange of goods between different regions or civilizations. These routes played a significant role in spreading ideas and religions during historical periods.
Cultural Exchange: The process through which different cultures interact with each other, influencing one another's customs, traditions, art forms, languages, etc.
Conversion: The act of adopting or switching to a new belief system or religion voluntarily. Conversion played an important role in the diffusion of religions like Hinduism to new regions.