What is the Biblical Gift of Tongues?

What is the biblical gift of tongues and is it still in true operation today? Is it biblical when mass crowds speak in unintelligible speech with no interpretation? Is a "private prayer language" something we see in the Bible? These are important questions that Christians should have answers to. In this episode, Costi Hinn interviews Justin Peters on the biblical gift of speaking in tongues, and the two compare it to what many people claim is "speaking in tongues" today.