Final answer:
In-depth interviews are characterized by probing follow-up questions, an engaging conversation, and open-ended responses.
Step-by-step explanation:
In-depth interviews are characterized by the use of probing follow-up questions, allowing the interviewer to engage the respondent in a conversation and keep the discussion on topic. These interviews can last an hour or more and do not rely on predetermined questions, giving the respondent the freedom to respond as they wish. The objective of an in-depth interview is to obtain complex and open-ended responses without expecting right or wrong answers.