The phrase refers to modified application packages (APKs) designed to extract audio in MP3 format from the YouTube platform. These applications typically bypass the official YouTube functionalities, allowing users to download audio content directly to their devices. An instance would be a user seeking a program to save a song or lecture from YouTube as an MP3 file for offline listening.
The prevalence of these modified applications stems from a desire for offline access to YouTube audio, a feature not natively supported by the official YouTube application without a Premium subscription. Historically, users have sought alternative methods to archive or listen to content without requiring a constant internet connection. The convenience and cost savings associated with these tools contribute to their persistent demand, despite potential legal and security concerns.