VOB stands for DVD Video Object. The VOB file is actually one of the core files that is found on DVD-Video discs and it contains multiplexed Dolby Digital audio (normally AC3 format) and MPEG-2 video. VOB is nothing but the file type that is used to store video on a DVD disc. It is mainly a MPEG-2 video which has special extension to support PCM, AC3, DTS audio, sub pictures and other button navigation.
MOV is nothing but a file extension that is used by the Quick Time wrapped files. This file format was created by Apple Computer to work with the multimedia files.These mov files are found abundantly on the web. Still in order to play these files on the Windows system, one has to install some extra software or an extra component or may convert it into other formats. MOV is a container format. It may contain formats like the video, animation, graphics, 3D and virtual reality (VR) content or other text like subtitles.

In order to play your VOB file with the help of QuickTime player you should first convert the vob file to a mov file. This can be dome only with the help of a video converter. There are many comprehensive video conversion programs available on the net that would help you to convert VOB to MOV.
There are many service providers available on the net who offer their vob to mov converter software to be downloaded. These softwares come as fire ware, sometimes as share ware and there are other service providers who make it available as a commercial product for a small amount. Whether you go in for free ware or share ware the first thing you need to do is download the software. Once it s downloaded, you can install it and run the converter on your system.
These converters usually have user interface program that would help you with guidelines and step by step instructions to help you do the conversion. The steps will be usually to give he input or add the VOB file to be converted. Then you need to specify the required output video format namely the MOV format. There will be some settings where you can specify the parameters for your output video to help you get the best quality. Finally you can start doing the conversion by clicking on the Start Button which may be available to start the process of conversion from VOB to MOV. The conversion process would just take a few minutes and it will be complete.