Answer:
Teleconferencing is voice-only or audio and video communication, while video conferencing supports the conference by providing both video and voice, so you can fully see the person when you are listening to the communicator,
Teleconferencing is capable of transmitting the data during the conference, either using traditional PBX systems or VoIP, while video conferencing offers VoIP services. The formal requires less bandwidth, while the latter is highly dependent on network bandwidth.