Apple Watch is a line of smartwatches designed, developed, and marketed by Apple Inc. It incorporates fitness tracking and health-oriented capabilities with integration with iOS and other Apple products and services. The first generation watch was available in four variants: Apple Watch Sport, Apple Watch, Apple Watch Hermès, and Apple Watch Edition; each was distinguished by different combinations of cases and first- or third-party interchangeable bands. Apple Watch (excluding Series 3 LTE) relies on a wirelessly connected iPhone to perform many of its default functions such as calling and texting. The first generation watches are compatible with iPhone 5 or later models running iOS 8.2 or later, through the use of Wi-Fi or Bluetooth.
The Apple Watch was released on April 24, 2015 and quickly became the best-selling wearable device with 4.2 million sold in the second quarter of the 2015 fiscal year. The Apple Watch Series 2 was released in September 2016, along with the Apple Watch Series 1. The Apple Watch Series 3 was released on September 22, 2017. Apple Watch connected via Bluetooth to the iPhone and accessed its compatible apps. Apple's development process was held very much under wraps until a Wired article revealed how some internal design decisions were made. The goal of the Apple Watch was to enhance the uses of an iPhone while also providing the user with some additional new features.