Answer:
The goal of an interview is usually to get a job and have very reasonable and formal questions about one's expertise, such as why should we let you in on this job or what is your level of experience in this area of expertise. However, it can also be to film a documentary or get to know somebody better, and both are conducted by people who have interviewed people many times. Interrogations are also formal and performed by experts, but they are usually strict and operated as a punishment or asking questions with the consequence of a penalty if answered suspiciously or incorrectly.