The Android Launcher
As you already know Android is a mobile operating system. And Android launcher refers to a computer program that is used to show and start-up customized home screen of an Android mobile. It is simply an Application launcher for any type of operating system either for Computer (Windows, Linux or macOS) or Mobile (Android or iOS). Android launcher specifically and obviously used in the Android operating system in order to launch an android mobile application.
Generally, Android launcher is built into any android device by default. But there are lots of customized launcher available on the Google Play and other available marketplaces.
Common Android Launcher