MKV (Matroska Multimedia Container) is a file format that can store multiple audio and video tracks, subtitles, and other metadata. This flexibility makes it an ideal choice for movie enthusiasts who want to experience their favorite films with multiple audio tracks. Dual audio, in particular, refers to the inclusion of two separate audio tracks within the same MKV file. This allows viewers to switch between two different audio languages or audio formats, such as 5.1 surround sound and stereo.