This is a slim, portable Blu-ray drive. It is designed specifically with small laptops in mind - those so small that they don't have room for a built-in drive. It provides the ability to read and write CDs and DVDs when needed, but can be stowed away when not in use to save battery power. It also plays Blu-ray discs, so it is a great way to add playback of newer movies to an existing system (though you may need software for that, too).

In practice this could also be used with a larger laptop if an addition drive is needed, or even with a desktop; any computer with USB ports should be able to use it.