A digital multimedia container format most commonly used to store video and audio, but it can also be used to store other data such as subtitles and still images.

The prefix _4VID is often associated with automated scripts or apps that simplify the URL of the source video during the conversion process. Safety & Usage Analysis

Based on common file naming conventions, is typically a generic name used by various third-party video downloader apps or web tools (such as those for YouTube, Instagram, or TikTok) to temporarily label a downloaded video file.

Sites that "rip" video from social media often generate files with simplified, generic names to avoid issues with special characters in the original titles.