Interview is a purposeful conversation between two or more people, requiring the interviewer to establish rapport and ask concise and unambiguous questions, to which the interviewee (the informant) is willing to respond, and to listen attentively. Interviews allow to gain insights into habits, attitudes, opinions, needs, etc. Interviews are usually conducted face-to-face, via telephone or videoconferencing. Occasionally, interviews may be conducted in writing.
Interviews may be highly formalised and structured, using standardised questions for each informant (structured interviews), or they may be informal and unstructured conversations (unstructured or in-depth interviews). In between there are intermediate positions depending on the level of formality and structure used (semi-structured interviews) (Saunders et al., 2016)