Google Playサービス is a background service provided by Google that helps apps on Android devices function properly. It allows apps to access features like authentication, location services, and cloud storage, ensuring a smooth user experience. This service also enables automatic updates for apps downloaded from the Google Play Store, keeping them secure and up-to-date. Additionally, Google Playサービス helps manage in-app purchases and provides access to Google APIs, enhancing the overall functionality of applications on Android devices.