The Apple Watch is a smartwatch developed and marketed by Apple. It has fitness tracking, health-oriented capabilities, and wireless telecommunication, and integrates with watchOS and other Apple products and services. The first Apple Watch was released in April 2015, and quickly became the world's best-selling wearable device: 4.2 million were sold in the second quarter of fiscal 2015, and more than 115 million people were estimated to use an Apple Watch as of December 2022. Apple has introduced a new generation of the Apple Watch with improved internal components each September – each labeled by Apple as a 'Series', with certain exceptions.
Each Series has been initially sold in multiple variants defined by the watch casing's material, colour, and size (except for the budget watches Series 1 and SE, available only in aluminium, and the Ultra, available only in 49 mm titanium), and beginning with the Series 3, by the option in the aluminium variants for LTE cellular connectivity, which comes standard with the other materials. The band included with the watch can be selected from multiple options from Apple, and watch variants in aluminium co-branded with Nike and in stainless steel co-branded with Hermès are also offered, which include exclusive bands and colours. Any user may use digital watch faces carrying those companies' branding.
