The Android file system contains folders for system apps, binaries, configuration files, fonts, framework files, libraries, and data. The main folders are /system for system components, /data for app data and backups, and /app for installed stock and third-party apps.

1. Android File System
Pietro Alberto Rossi

2. Layout

3. /system
/app Stock apps installed
/bin Native binaries and daemons
/etc Configuration files
/fonts TTFs
/framework Android framework .jar files
/lib Native libraries
/usr Miniature “/usr”
/xbin Optional/Extra binaries

4. /data
/anr ANR traces
/app App install location
/app-private Protected apps
/backup Backup Manager
/dalvik-cache Dalvik DEX cache
/data App data
/dontpanic Last panic output
/local Shell-writable space
/misc Miscellanea data
/property Persistent system properties
/secure Secure Android data available
/system System data