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GApps (Google Apps) are the proprietary Google applications and services that are not included in AOSP (Android Open Source Project) builds. Typical packages include the Play Store, Google Play Services, Google Framework, Gmail, Calendar, Google Maps, and other Google apps. Custom ROMs based on AOSP or LineageOS often do not ship with GApps due to licensing, so users install a GApps package separately. gapps android 51