IDVD

From ICHKWiki

iDVD is an application that is installed on every mac, It is used to watched multiple DVD's also It's function is to put multiple films or videos and put them together in a single DVD with a professional looking themes.

This is very useful and it dosen't cause much hassle all you need to do it chose your DVD then put it in your computer then it only takes a few seconds to warm up and then Ta-Da your ready to watch your movie!