VOB (abbreviation for Video Object) is a file format representing the movie data from a DVD and it is usually located in the VIDEO_TS folder.
Because VOB files contain the most data on a DVD disc, they include video, audio, and subtitles, as well as interactive menus.
VOB editors will offer their users the option to easily split, join or merge files, in order to obtain the file they require.
Also, some of these apps can allow users to quickly apply various effects in order to personalize the video's appearance.