An exit interview is a survey taken by an employee who decide to call it quits. It's a final series of questions where the organization can learn about its employees' opinions and experiences.
What made you start looking for a new job?
How was your relationship with your supervisor?
Were you given the tools needed to carry out your job?
How would you suggest your job be changed in the future?
How was your work/life balance during your time here?
Did you like working here?
What can we do better as an organization?
But before you start asking these questions, you need to understand why you’re asking them.