MTS (MPEG Transport Stream) is a digital video file format used for storing high-definition video content. It is commonly used in AVCHD camcorders and digital video cameras. MTS files use the H.264 video codec and the Dolby Digital (AC-3) audio codec, which provide high-quality video playback with relatively small file sizes. The format is designed to store high-quality video content without sacrificing video quality or audio quality. MTS files can be played back on a variety of media players, including VLC, Windows Media Player, and QuickTime, and can also be converted to other more widely supported video formats like MP4 or AVI using compatible media conversion software. Overall, MTS is a useful video file format for storing and sharing high-quality video content captured by digital video cameras and camcorders. However, it is not as widely used as more modern video file formats like MP4 or MOV.