Final answer:
The ethnographic research method involving direct participation and immersion in a culture to study it is called participant observation.
Step-by-step explanation:
The method of ethnographic research that involves studying and writing about a culture through direct experience or immersion is known as participant observation. In this type of research, the investigator becomes a part of the community being studied to collect data and gain an insider's view of the culture. Through participant observation, researchers immerse themselves in various social contexts such as different kinds of workplaces, communities, or religious gatherings to observe and participate while making systematic observations. Ethnographic study is imperative for understanding a society's norms, behaviors, and the reasons why people live, work, or socialize within certain cultural boundaries.