In addition, the extra disc space means there's room for significantly more content and special features. When you buy a DVD movie, you're usually not just getting the movie--you're also getting the extra features that come along with it, like director's commentary and making-of documentaries (depending on the disc, of course). With Blu-ray, there's the possibility for previously unheard-of special features. Imagine, for example, interactive content, like a director on the screen explaining the shooting of a scene while the scene is playing in the background, or the ability to dynamically deliver new content to your Blu-ray player using the internet, a feature called BD-Live, such as new movie trailers or additional language tracks.