The inclusion of multiple language tracks (usually the original English alongside a localized dub like Hindi, Spanish, or French) within a single file.
Buy a Blu-ray disc (often includes Hindi, French, or Spanish audio). Use MakeMKV (free) to rip the disc to an MKV file. Then use HandBrake to compress to 720p H.265. This gives you an "Extra" quality file that is 100% legal (for personal backup, in most jurisdictions). Hollywood Dual Audio 720p Mkv Movie Download -Extra