If you have a laptop or desktop computer that didn't come with a DVD drive, you buy a cheap external DVD drive. With this device, you'll be able to play DVDs and access DVD-ROMs on your computer in the same way you can on an internal DVD drive. Many of the best external DVD drives available for sale are also able to burn DVDs in order to store files or make video disks. They are powered through your USB port, so you don't need to hunt for an electric outlet. A slim external DVD drive can be slipped into to computer case to take with you wherever you go.