In market research, in-depth interviews are a type of qualitative research in which extensive one-on-one interviews are conducted in order to gather detailed information and insights about a particular topic. In-depth interviews are often used with luxury brands or healthcare companies, as they provide a more personal level of interaction that can be difficult to achieve with other research methods. The interviewer will usually ask several open-ended questions in order to encourage the respondent to share their thoughts and feelings on the subject. In-depth interviews can be conducted in person, over the phone, or online. Market research firms typically use in-depth interviews as part of a larger market research project in order to gain a better understanding of consumer or patient behavior.