I noticed that occasionally, the title of a course will be something like "Special Seminar in Topic X". A student can take this special seminar course for 3 course credits, just like a regular course. What is the difference between a seminar course and a regular course, and why is the seminar course referred to as a "seminar"?
(I do have some knowledge about what a seminar course is, but I am asking this question because I feel that the answer may be useful for others.)