"Use your PC as if it were a Walkie Talkie."
Although not immediately obvious just from its name, if Zello were to be defined in just two words, then Walkie Talkie would be used.
And it's that Zello is a simple and practical free application that will convert your computer into a Walkie Talkie, so you can talk with friends over the network, completely for free.
The hallmark of the Zello program is that it's compatible with those using a smartphone and can communicate with several people at once. The only prerequisite is to have an internet connection either via a network or WiFi.