A more thorough explanation:

Definition: An interrogator is someone who asks questions to another person.

Examples:

• The police interrogator asked the suspect about his whereabouts on the night of the crime.
• The job interviewer acted as an interrogator, asking the candidate about their previous work experience.

The examples illustrate how an interrogator is someone who poses questions to another person. In the first example, the police interrogator is trying to gather information from the suspect to help solve a crime. In the second example, the job interviewer is trying to learn more about the candidate's qualifications for the position. In both cases, the interrogator is asking questions to gain information or insight.