Radio formats refer to the overall content broadcast on a radio station. There are many formats designed to reach specific audience segments based on demographics like age, ethnicity, and background. Popular formats include talk shows, interviews, and phone-in programs. Talk shows usually feature a host interviewing guests on various topics in segments separated by advertisements or music. Interviews can be opinion-based or informational, and require preparation, rehearsal, and knowledge of the subject. Phone-in programs allow listeners to share opinions on discussed topics by calling in. Effective radio interviews and phone-in programs require organization and an engaging host who can share the spotlight and promote guests.