Android Kit Applications. Majority of people nowadays have smart phones which are either windows, Mac or Android OS. The commonest OS is the android. The availability of Android as an open source platform has enabled many mobile manufacturers to install it on their gadgets. Mobile phones, therefore, have become cheap to manufacture since an OS is already available. Android apps are the most popular as compared to other applications that are being developed today. Each of the application when complete can carry different files and folders. The features of an app are determined by the files and folders it carries. An archive that has all the essentials need to be built before one can operate the app on a mobile phone. Android package kit is the term used for the archive file. All the data and files that are required to run an app on a cell phone device are contained in an APK package. The package kit has a code that determines its capabilities and functions. It is generally referred to as classes.dex. Android package has another component known as the manifest. The component provides specifications for permission to the application’s needs, package, it’s flow, signatures, certificates, version codes and SHA-1 Digest. Another important component of the apk is referred to as libs. The element comprises jar files and codes which act as library for the application. Texts, audios, and fonts are stored in the APK component known as the asset. The resources component is the element which defines the layout for the various pages of the app. Other directories contained in the kit includes META-INF and res. Development of an app requires that it is tested before release into the market. A secret key code is then used to sign in the application. This is done to prove of their authority over the application. The signed APK is then uploaded to Google play store so that users can have access to it. When one is downloading the app from sources such as Google play store, the APK is the one that is downloaded and installed on the phone. Android Apps can also be accessed from APK MIRROR. It is easy downloading applications found in Google play store using the APK MIRROR. It, however, does not require one to have an account. Security measures have been put in place by both APK MIRROR and Google to ensure that only original and trusted apps are made available to customers. The High-security measures include signature authorization and verification of certificates. One advantage that comes with using APK MIRROR is the capacity to access earlier versions of an app.