What type of diffusion describes how the number of people that possesses a particular culture trait increases?

The type of diffusion that describes the increasing number of people who possess a particular cultural trait is known as "contagious diffusion." This occurs when a cultural trait spreads rapidly and widely through a population, often through direct contact or social interactions. For example, the popularity of a fashion trend or a viral social media challenge exemplifies contagious diffusion, as it quickly reaches a large audience.