An informational interview involves meeting with someone in a field or career of interest to learn about their job and career path. It allows you to gain an understanding of a particular role or industry, make contacts, and discover opportunities without the pressure of a job interview. The document provides guidance on setting up informational interviews, including introducing yourself via email, preparing questions to ask, conducting yourself professionally during the meeting, and following up with a thank you. The overall aim is to learn from someone else's experiences.