How do I find installed apps on Android?

On your Android phone, open the Google Play store app and tap the menu button (three lines). In the menu, tap My apps & games to see a list of apps currently installed on your device.

Where is the app folder on Android?

Actually, the files of the Apps that you downloaded from the Play Store are stored on your phone. You can find it in your phone’s Internal Storage > Android > data > …. In some of the mobile phones, files are stored in SD Card > Android > data > …