Probes are used by researchers to support and encourage participants during interviews to reflect or speak in more detail on a particular issue.
Some examples of common probes used in conducting in-depth interviews include:
Reference:
Hesse-Biber, S. N. 2014. Feminist Approaches to In-Depth Interviewing. In: S. N. Hesse-Biber (ed), Feminist Research Practice: A Primer, Los Angeles, London, New Delhi, Singapore, Washington DC: Sage, p. 198.