Many apps on Android devices depend on the use of Google Play Services, and the package requires the user to use a Google Account and agree to Google's terms of service. The packages' services include location tracking and geofencing, single sign-on account services, user health and fitness tracking, payment processing, integrated advertising, and security scanning. It expanded to cover a variety of Google services, allowing applications to communicate with the services through common means. When it was introduced in 2012, it provided access to the Google+ APIs and OAuth 2.0. It consists of background services and libraries for use by mobile apps running on the device. Google Play Services is a proprietary software package produced by Google for installation on Android devices.