In which type of research, researcher observes the subjects by being a part of their group?

In ethnographic research the researcher observes subjects by becoming a part of their group through participant observation in their natural setting.

Action research aims to solve a practical problem and improve practice, not to embed for observation.

A descriptive survey gathers data through questionnaires and interviews without joining the group.

Experimental research manipulates variables under controlled conditions.

Ethnography produces thick, contextual description of a culture or community.

It grew out of social anthropology and fieldwork traditions.