The Google Installer for MIUI 12.5.5 Android 10 REPACK plays a crucial role in bridging the gap between MIUI users and Google services. By allowing users to easily install Google services on their devices, this tool enhances the functionality and usability of Xiaomi devices running on MIUI. The installer typically includes essential Google apps such as the Google Play Store, Google Services Framework, Google Play Services, and other Google apps.