Even audio and video conferences are possible without the use of computers.
Computers combine all the previously mentioned media.
This new form of communication, computer conferencing can be a very good means for group discussion. All comments on a certain topic can be stored and made accessible to all participants of the discussion. This provides the shared space essential to group interaction. Even if the teacher uses transparencies, which can be copied for the students, instead of a blackboard, students' questions and comments are lost. This means that some people don't feel comfortable with the fact that their comments will be stored in a database.