They allow for face-to-face and visual communication over long distances. It allows instructors to teach several classrooms at once. This is especially useful if students in a remote educational institution do not have a qualified instructor of their own. Meetings can be conducted more efficiently without the need for costly and potentially dangerous travel
In my opinion, educational institutes should have video conferencing set up to be able to hold interactive classes with other students from any part of the world. This can make class more interesting as different theories and ideas are set up.