Voice chat

From AionSource.com Wiki

Voice chat is a modern form of communication used on the Internet.

The means of communicating with voice chat is through any of the messengers, mainly Yahoo! Messenger, AOL Instant Messenger or Windows Live Messenger. Voice chat has led to a significant increase in distant communications where two or more people from opposite ends of the world can talk almost free of cost.

Many video games with online multiplayer allow players to communicate via voice chatting. See also here.