Voice mail
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is the exchange of text messages and computer files transmitted via a communication network such as a local area network or the internet
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permits users to converse in real time with each other via the computer while connected to the Internet
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functions much like an answering machine, allowing callers to leave a voice message for the called party
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involves using video and computer technology to conduct a meeting between participants at geographically separate locations
Voice mail functions like an answering machine - callers can leave voice messages when the recipient is unavailable or chooses not to answer. Unlike email (text), chat (real-time text), or video conferencing (visual meetings), voice mail specifically stores audio messages for later retrieval. It's an asynchronous communication technology.