The functionality described by the phrase involves transforming video content hosted on a specific online platform into audio files in a widely compatible format, without incurring any cost to the user. As an example, an individual could use such a service to extract the audio track from a lecture available on a video-sharing website, saving it as an audio file for later listening.
This capability offers users the advantage of accessing audio content from video sources in a more convenient and portable manner. It allows for listening on devices lacking video playback capabilities, reduces data consumption, and facilitates offline access. Historically, the demand for this functionality arose as a result of increasing bandwidth limitations and the desire to isolate audio portions from lengthy video recordings.