When you provide an answer to an interviewer's question, you should be prepared to dig deeper into the topic. Interviewers will ask questions ranging from very casual to very in-depth. These depend on the specific topic and how important it is to the organization's operations you are interviewing with. The best way to prepare for an interview is to review the job posting to completely understand the requirements and duties you are expected to perform. You should also research the organization and learn as much as you can about its operations. Sources for this information include their website, current and former employees, and industry publications. The more you know about the organization, the better prepared you will be for the interview.