The phrase describes the ability to acquire, without monetary charge, a software application or web-based service that facilitates the extraction of audio, specifically in the MP3 format, from video content hosted on YouTube. Such tools enable users to save the audio track from YouTube videos as individual audio files.
The perceived value of these tools lies in their accessibility and convenience. They offer a method for offline listening to audio content originally available on YouTube, circumventing the need for constant internet connectivity. Historically, the demand for such services arose alongside the increasing popularity of YouTube as a source for music, podcasts, lectures, and other audio-centric content.