Apple has been introducing the world to its products via the same method for years - using simple white backdrops and music, sometimes with no voiceover. It reflects the simple design of their products, while making the technology truly shine.
Shooting marketing videos with white backdrops can increase your production value and bring focus to your subject, rather than having anything distracting going on in the background.
Black backgrounds can create a similar effect. However, getting a true black background, while at the same time properly lighting the subject, is difficult. This technique still isolates the product, as with the white background, but has a slightly cooler, darker look - and separates the video from all the other white background videos.