The phrase describes a class of online tools designed to extract the audio component from video content hosted on YouTube and save it as an MP3 file. These utilities enable users to acquire audio tracks from YouTube videos, effectively transforming them into downloadable music or audio files suitable for playback on various devices.
The prevalence of these tools stems from a desire to access audio content from YouTube offline and on devices with limited or no internet connectivity. The practice allows for the creation of personal music libraries or the archival of audio from lectures, interviews, and other non-music content. However, the legality of using such tools is often debated due to copyright implications and potential violation of YouTube’s terms of service.