The Apple Watch is an example of "wearable technology", because it is worn around the wrist in the same way as a traditional wristwatch. However, it is much more than a wristwatch. It not only tells the time and date but also tracks the fitness of the person wearing it and monitors the person's health. It can also do many of the same things that an iPhone can do, such as use Apple's Siri personal assistant, but it needs to be "paired" with an iPhone for it to do these things, meaning that it will not work if you do not have an iPhone. The Apple Watch has many different designs: there is the standard version, a "Sport" version designed for athletes, and an "Edition" version which is made as a fashion product. These all run "watchOS", a modified version of iOS.