APK stands for Android Package Kit — it is an installation file built for the Android operating system. Just as a .exe file installs software on a computer, an APK file installs any app on an Android phone. Installing an app this way, outside of the Google Play Store, is called "sideloading".
The golse Android app is available in APK format and must be obtained only through the official channel. Once installed, you can access the full golse Casino game library, live tables and sports betting — all in one place.
An iOS version of golse is also available, but this page focuses on the Android APK. A separate process applies for iOS users.