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DVD, also know as Digital Video Disc is an optical disc storage media format and was invented over 15 years ago. As we all know one of its main uses is to store video. If you look at the files within a DVD you will find .ifo, .bup and .vob files. The .ifo files (Information) and .bup (Backup) tell the device reading the DVD where everything is, where to find it and what the device should do. A .vob file (Video Object) is a container format for DVD media. A container format is basically a meta-file whose specification describes how the data is stored (but not coded). Certain programs and devices are able to identify and open container files, some examples are Windows Media Player, QuickTime, VLC, PowerDVD and an old fashioned DVD player.
What confuses users is the file extension. Many users I’ve talked to are unfamiliar with .vob and the “wrapper concept.” I think it is best to think about it like this, a .vob file is a label or wrapper that describes the video, audio, subtitle and menu information. This label or wrapper provides the information needed for PowerDVD, QuickTime, Windows Media Player, VLC and your DVD player to play the video AND provide you with audio, subtitle, chapter and menu information. In this case, we just want to grab the digital video content from the .vob file.