When teaching happens through a video conferencing platform it is online tutoring.  Students and teachers meet in virtual classrooms. Like any other regular class, students and tutors do have to connect on a regular basis, there is an electronic whiteboard which both can use and see, there are assignments and tests too. Online tutoring or online tuition is not restricted to any physical realm. Students and teachers can connect with each other from any corner of the world!! Good internet connection being its only restricting aspect. 

With online tutoring students can learn at their own pace and in their own way. Online tutoring befits students of all ages.  Students who miss out on any class due to participation in any extracurricular activity or for any other reason can always take a session online.

Source : growingstars