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*Advantage
It’s cheaper: your users can learn using any device connected to the Internet. There’s no need to spend a lot of money renting a building, paying an expensive electricity bill, internet connection and running water so you can get your students physically there to take courses. And a lot less money spent on transportation.
It takes less time: there’s no need to spend time commuting to and from the classroom, for both the teacher and the students. Also, the teacher/trainer doesn’t need to give the same class over and over again to a different group of students. He or she only needs to prepare the content once, and then share it different groups of students – not necessarily at the same time.
It allows for self-paced learning: students or trainees can take their courses anytime, anywhere. Using their own devices. Students who don’t have time for regular classes can learn online whenever they do have time.
It’s modern: Most people today prefer to consume content using the Internet rather than in any other way. Actually, the very fact that you are reading this right now is proof of that! That includes learning about the news, watching TV, talking to friends, booking appointments, shopping... and the list goes on. Why should learning still remain strictly traditional while everything else seems to be going on a different direction?
*Disadvantage
Plagiarism: if your students are using a computer and not being watched by you at all times, they may plagiarize essays and other assignments.
Cheating: it can be easier to cheat if you are taking an online exam.
Isolation: since you don’t have to be physically present in a classroom in order to learn, it might be more difficult (or impossible) to get in touch with other learners.