The phrase refers to a type of online tool used to extract audio from YouTube videos and transform it into the MP3 format at a bitrate of 320 kilobits per second. This bitrate signifies the level of audio quality, with 320 kbps generally considered high quality for MP3 files, approaching CD quality. Users commonly employ these tools to create downloadable audio files from content found on YouTube, such as music, podcasts, or lectures.
The ability to obtain high-quality audio from YouTube videos offers several advantages. It allows for offline listening, circumventing the need for a constant internet connection. Furthermore, it provides a way to archive content that may be removed from YouTube in the future. The historical context lies in the increasing availability of streaming content and the desire of users to have greater control over their media consumption, leading to the development and widespread use of these conversion tools.