If this is a new acronym to you, it was for me too until this week’s Security Now! podcast, where Steve Gibson mentioned it.
Evidently, tech companies are providing voice cloning services which combine the ability to provide ever more human-like voice patterns with an option to upload samples of real voices.
Rather than talk about the (mis)uses that this could be put to, you might want to read the article for yourself. The links are at https://twit.tv/shows/security-now/episodes/924?autostart=false and in the show notes PDF, it starts on page 17.