The phrase denotes a type of online service or software application designed to extract the audio component from video content hosted on YouTube and subsequently convert it into the MP3 audio file format. These tools enable users to obtain an audio-only version of YouTube content, facilitating playback on devices that support MP3 files, such as smartphones, portable music players, and computers.
The utility of such services lies in their provision of offline access to audio content found on YouTube. Users can listen to music, podcasts, lectures, or any other audio-based content without requiring an active internet connection. Historically, the emergence of these converters reflects the increasing desire for portability and accessibility of digital media, coupled with the widespread adoption of the MP3 format as a standard for audio compression.