IPTV comes in three different flavors. The first kind—and the one you’re probably using already—is called video on demand (VOD). With this type of service, you select a TV program or movie you want to watch from a wide range, pay your money, and watch it there and then. A different kind of IPTV is being offered by some of the world’s more enterprising TV broadcasters. The channel makes its last week’s programs available online using a web-based streaming video player.. This kind of service is sometimes called time-shifted IPTV, because you’re watching ordinary, scheduled broadcasts at a time that’s convenient for you. The third kind of IPTV involves broadcasting live TV programs across the Internet as they’re being watched—so it’s live IPTV or IP simulcasting. All three forms of IPTV can work either using your computer and an ordinary web browser or (for much better quality) a set-top box and an ordinary digital TV. All three can be delivered either over the public Internet or through a managed, private network that works in essentially the same way (for example, from your telephone and Internet service provider to your home entirely through the provider’s network).