The phrase describes a type of software or online service that enables the extraction of the audio component from video content hosted on YouTube, subsequently saving it as an MP3 file. For example, a user might employ such a tool to isolate the music from a concert recording on YouTube, creating an independent, portable audio file.
These tools provide several benefits, including the ability to listen to content offline, conserve mobile data, and create personalized audio collections. Historically, the demand for these services arose alongside the increasing popularity of YouTube as a vast repository of audio-visual content, coupled with the desire for users to access audio independently of the video component.