① Audio graphic conferencing system

The audio graphic conference system mainly utilizes voice for multi-party communication, and is supplemented by communication devices such as fax machines to transmit graphic files. This is an early form of conference system.

② Video conferencing system

Video conferencing is a system that utilizes digital video compression technology to utilize video information streams in meetings, also known as audiovisual conferencing. In the meeting, attendees can not only hear the voices of others, but also see their gestures and facial expressions.

③ Data conferencing system