Ventrilo is a VOIP or voice over internet protocol. In other words, it lets users chat with each other over the internet instantly. Ventrilo is known for its super high quality voice codecs, and for being simple and reliable. The difference between Ventrilo and something like Skype is that Skype creates a direct connection between two or more clients through a peer to peer network. Ventrilo, on the other hand, first gives this information to a server where it is then transmitted to everybody else connected to that server.
This method makes Ventrilo an attractive resource for gamers. The servers are more stable and more reliable than direct connections, and the voice quality is supreme. The program also happens to be very lightweight, as to not distract processing power from high performance games. Ventrilo is the choice application for gamers who want to talk to other gamers.