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If you want to install an application on Windows, we have an .exe file for that. For Mac OS X, we have .dmg files. Those of you who come from Symbian and Java phones background must be knowing about the .sis, .sisx and .jar files. In the same way way, have a specific file format for Android smartphones that is used to install application on it and it is called an APK file (because it has the extension of .apk)
APK files are analogous to other software packages such as APPX in Microsoft Windows or Deb packages in Debian-based operating systems like Ubuntu. To make an APK file, a program for Android is first compiled, and then all of its parts are packaged into one file. An APK file contains all of that program’s code (such as .dex files), resources, assets, certificates, and manifest file. As is the case with many file formats, APK files can have any name needed, provided that the file name ends in “.apk”.
APK files can be installed on Android powered devices just like installing software on PC. When a user downloads and installs an Android application from either an official source (such as Google Play), or from some other (unofficial) site, they are installing an APK file on their device. A user or developer can also install an APK file directly to a device (that is, not via download from the network) from a desktop computer, using a communication program such as adb. By default, the ability to install from unofficial sites or directly from a desktop is disabled for security reasons on most Android devices. You can enable it by changing the setting “Unknown sources” in the Settings menu.
You must find an APK file that you want. Search online for an APK file and download it to an easy-to-find location on your computer (like your desktop). Before you can install it on your phone you will need to make sure that third-party apps are allowed on your device. Go to Menu > Settings > Security > and check “Unknown Sources” to allow your phone to install apps from sources other than the Google Play Store. If you like, you can also download an app like ES File Explorer so you can easily find files on your Android device.
Once you have downloaded the file on your computer, connect your device to it. At this point, you may be asked if you simply want to charge your phone or connect it as a “media device.” Choose “media device”. Then, simply find your phone’s folder on your computer (it will be in “My Computer” or “Computer” on Windows machines) and copy the APK file into a folder of your choice in your Android smartphone.