A System app is an app which is placed under /system/app folder in an Android device. As /system is read-only, such an app cannot be uninstalled by an "ordinary" user.

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How do you disable system apps in Android 4.x.x (and up)?

I heard you can "freeze" or "disable" apps starting in Android 4.0 without rooting. How do you do it?
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How do I properly install a system app given its .apk?

I removed a system app (com.android.mms) and I have the .apk needed to restore it, however it won't install through the standard channels (running the .apk gives me "application not installed"). ...
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votes
3answers
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Will factory resetting wipe/clear away pre-installed apps?

I linked my Gmail account to my tablet and I longer want it linked. I have read that it is permanently linked, and I must factory reset the device to unlink the account - is this true? Will factory ...
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votes
1answer
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Modifying android system apps

Does anyone know a good articles or tutorials explaining how to go about it? Do I need to recompile android sources after modifying system apps and then install them on my emulator device somehow? ...