Manage Your Content and Devices: Learn The Secrets of Android and Unlock The Full Potential of Smartphones, Tablets and Smart Watches

Third-Party App Stores
Of more importance, Android permits users to go for third-party app stores.
The most well-known and popular one amongst others is Amazon’s Appstore
for Android, which gives away a free paid app every day. The Appstore of
Amazon, which is used for Android, is also used natively on Amazon’s
Kindle Fire devices.
The popular Humble Bundle, which remains popular and sells bundles of
indie games for Linux OS, Windows OS, and Mac OS, has also sold Android
games. If you purchased any of these games that are gotten in Humble
Bundle, containing Android games, you could install the Humble Bundle app
and use it to manage the installation and updating of your Humble Bundle
games like that. So to either use the Amazon Appstore, or the Humble
Bundle, or any other third-party app stores, you will really need to side-load
the app store’s Application.
Some devices may also come with their own, as it is integrated into third-
party app stores. Let's take an instance, Samsung devices usually come with
the Samsung Apps Application, which may contain some free versions of
some paid apps, but is otherwise fairly uninteresting definitely. And carriers
have distributed their own very app stores with their Android devices in the
past, but this is becoming very very less common.
Similarly, you should be very careful when side-loading apps, that is how
you should be even more careful when using third-party app stores. For
instance, you can probably trust Amazon and the Humble Bundle, but you
should beware of certain other app stores which are suspicious. Just take this
instance, an untrustworthy app store distributing is distributing some pirated
applications and may be a source of malware, so it is so recommended that
you stay away from those.

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Downloading Apps From Your PC
You are also permitted to side-load Applications into your Android device in
done other ways, one of which is, if you have an APK file on your computer,
you may make use of the excellent AirDroid app to upload it right into your
Android device and install it all at once without even connecting your
Android device to your computer.
Also, if you're an app developer, you can make use of the adb command —
Android debug bridge command — for you to “push” an app to a connected
device, you will then make you to install it from your computer. The
appropriate command is as follows, where D:\app.apk is the path to the APK
file on your computer: