Why would you consider an interview a learning experience?
An interview is an intense learning experience for both the applicant and the person(s) conducting the interview. During the conversation and other activities that make up the interview process, both parties have opportunities to learn a great deal about the other.
As a person being interviewed for a potential position, you should come into the interview with specific questions that need to be answered before the end of the interview. You need to know what the expectations for the position would be, which gives you the chance to learn the types of activities in which the job would be involved, the environment and arrangement of work activities, the amount of teamwork and cooperative effort that might or might not be involved in the job, and so forth. The interview should also provide answers to basic questions regarding hours and days to be worked, requirements for uniforms or tools, and benefits available to employees.
An interview may help you to understand that a given position would not involve work assignments that you are interested in fulfilling. You may also discover during an interview that you don't have the education or experience needed to do the job. On the other hand, the interviewer may sense potential that marks you as a person ready, willing, and able to learn the skills needed for the opening!