The phrase refers to the process of saving video content from the YouTube platform to a computer or device in the MPEG-4 (MP4) file format without incurring any cost. This action typically involves utilizing third-party software or websites designed to extract the audio and video stream from YouTube’s servers and package it into a downloadable MP4 file. For example, a user might employ such a tool to archive a lecture or save a music video for offline viewing.
The appeal lies in the ability to access content independently of an internet connection, enabling consumption in areas with limited or no network access. It also allows for personal archiving of content that may be subject to removal from YouTube. Historically, the desire to preserve and repurpose online video has driven the development of numerous methods and tools for this purpose, ranging from simple browser extensions to more sophisticated desktop applications.