Final answer:
Participant observation is a research technique in which the researcher infiltrates a group of individuals to study their behavior and relationships from an insider perspective.
Step-by-step explanation:
Participant observation is a research technique in which the researcher infiltrates a group of individuals to study their behavior and relationships from an insider perspective. The researcher immerses themselves in the group or social setting, often assuming a role within the group, to gather firsthand observations and experiences. This method is commonly used by sociologists and ethnographers to gain a deep understanding of a specific cultural community or social phenomenon.