A seminar is generally understood to be a small group meeting in which students and a tutor discuss information on a chosen topic. They may be called something else such as "tutorial groups". Seminars provide an opportunity to explore topics by discussion, and to identify and sort out any problems. Some tutors may use the opportunity to introduce new related topics. Most seminars last for an hour. Seminars need not necessarily be face-to-face contact, they can also occur in online environments.