IFO, DVD Info File (.ifo)
The IFO Video file format
Files with the IFO extension are commonly known as those files that store information on a DVD. These files add information such as startup-scenes, chapters, and time to a movie stored on a DVD. It works together with VOB and VRO files which store the actual audio and video data for the movie.
Technical details of IFO files
The IFO files are those files which store DVD information. These files are referred to as DVD Info Files because they contain information such as scene and timing. Files with the IFO extension let the computer, DVD player, or other device know which screen to show at start-up, where each chapter of the movie starts, where the audio tracks are located and where subtitles can be found. In conjunction with those files that store the actual audio and video data (VOb and VRO) the IFO is responsible to run the DVD.