GMS is called GoogleMobile Service, or Google Mobile Service. Provide support for a series of Google applications on Android. For Android, it is an Android device configuration service.
Gms installer downloads and installs Google Mobile Services software package, embeds Google Mobile Services (GMS) into Android mobile phone system, and gives different degrees of authorization to Android mobile phone manufacturers. It aims to let users use Google Search, Google Maps, Gmail, YouTube and other Google service products by using mobile phones or other mobile devices.
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Overseas platforms rely heavily on GMS installers. When using Google Stores, which logs into overseas websites, you must use Google three-piece suite (Google service framework, Google play Store and Google play service) and run it based on GMS installer. If not, you will not be able to install overseas applications or be prohibited from downloading them.
Many apps don't have GMS installers, or even can't run at all. Even if it can be run after successful installation, there will be "flashback" or "service stop". And there is no way to use it normally, but the equipment without it can still get GMS service in some ways.