An interview can be a valuable source of information.
During an informational interview, you can ask questions intended to help you better understand a field of interest. Informational interviews are a way to converse, network, and obtain insight into a particular industry. These interviews do not involve job requests, but rather are a method of learning and networking simultaneously.
For example, if you are writing a paper, an interview with an expert in the field can provide firsthand knowledge and unique perspectives that may not be available in other sources.