Google Play, which is also known as the Google Play Store or Play Store (and was formerly known as the Android Market), is a digital distribution service operated and developed by Google. It serves as the official app store for certified devices running on the Android operating system and its derivatives, as well as ChromeOS, allowing users to browse and download applications developed with the Android software development kit and published through Google. Google Play has also served as a digital media store, with it offering various media for purchase (as well as certain things available for free) such as books, movies, musical singles, television programs, and videogames. Content that has been purchased on Google TV (previously known as "Google Play Movies & TV") and Google Play Books (previously known as "Google eBooks") can be accessed on a web browser (such as, for example, Google Chrome) and through certain Android and iOS apps. An individual's Google Account can feature a diverse collection of materials to be heard, read, watched, or otherwise interacted with. The nature of the various things offered through Google Play's services have changed over time given the particular history of the Android operating system. Applications are available through Google Play either for free or at a cost. They can be downloaded directly on an Android device through the proprietary Google Play Store mobile app or by deploying the application to a device from the Google Play website. Applications utilizing the hardware capabilities of a device can be targeted at users of devices with specific hardware components, such as a motion sensor (for motion-dependent games) or a front-facing camera (for online video calling). The Google Play Store had over 82 billion app downloads in 2016 and over 3.5 million apps published in 2017, while after a purge of apps, it is back to over 3 million. It has been the subject of multiple issues concerning security, in which malicious software has been approved and uploaded to the store and downloaded by users, with varying degrees of severity. Google Play was launched on March 6, 2012, bringing together Android Market, Google Music, Google Movies, and Google Books under one brand, marking a shift in Google's digital distribution strategy. Following their rebranding, Google has expanded the geographical support for each of the services. Since 2021, Google has gradually sunsetted the Play brand: Google Play Newsstand was discontinued and replaced by Google News, Google Play Music was discontinued and replaced by YouTube Music and Play Movies & TV was rebranded as Google TV on November 1, 2021.