Qualitative research is in-depth research designed to understand customers' behaviors, feelings, and thoughts. There are six main types of qualitative research: in-depth interviews, focus groups, ethnographic research, action research, content analysis, and case studies. In-depth interviews involve personal interviews with individual respondents to capture rich, descriptive data. Focus groups collect data through group discussions led by a researcher. Ethnographic research immerses researchers in participants' natural environments. Action research aims to solve problems through collaboration. Content analysis interprets words and images to draw conclusions. Case studies provide in-depth analysis of real-world situations or events.