VOB stands for Video Object. Files that contain the .vob extension are container files. A container file is a "shell" of a file that is able to hold a variety of other files within it. This means that the .vob file can hold multiple files that are merged into a single file location on a user's computer.
The .vob file format is most commonly used for DVD media. A VOB file can contain the audio and video data for the contents of a DVD as well as the subtitle, menu and DVD content information. This file data is then multiplexed together into a streaming format that allows the user to watch the media on his or her computer.
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