APK is the file format used to distribute and install software on Android. APK stands for "Application Package File".

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Android - how to install apk from SD card

Is it possible to install an app to an Android phone from an SD card? To install it without a data connection, the marketplace, or using ADB? I've tried searching for this but no luck so far.
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What does APK stand for? What is the internal format?

Is APK an abbreviation for Android Package Kit? What about the file itself? Is it an archive such as ZIP where during install the installer extracts and copies the files onto the file system?
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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"). ...