This is the technical part of the query. By adding ".mp4" to a search, a user is specifically looking for video content rather than just static images or articles. Why MP4 is the Standard for Digital Media

: Never download files from unsolicited links or platforms known for hosting pirated content. Enable File Extensions

Be wary of files that claim to be ".mp4" but end in ".exe" or ".zip," as these can contain unwanted software.