The document defines an interview as a conversation between two or more people where the interviewer asks questions to the interviewee to obtain responses or answers. It discusses different types of interviews such as structured, unstructured, one-to-one, group, and online/video interviews. The nature of interviews includes social interaction, investigating issues in depth, discovering thoughts and feelings on topics, and establishing rapport between interviewer and interviewee. Merits are flexibility, high response rates, ability to judge non-verbal behavior, and permitting deeper responses. Demerits include high costs, time-consuming nature, potential for biases, and subjectivity of interviewer.