Android Kit Applications. Smart phones currently nowadays have become very popular and come with a variety of operating systems such as windows, Mac or Android. The commonest OS is the android. Many mobile phone manufacturers can install android applications in their gadgets since it is an open source platform. This has made the cost of the devices less than making their operating system or using one that is paid. Many applications are being developed today, and those generated by Android are known as the android application. Files and folders of different types can be carried in an application when it is fully developed. The files and folders define the capabilities of the app. In order for a mobile app to function, an archive with all the necessities is required first. 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. It comprises of a source code that defines the functionalities of the app. Classes.index is the technical term for the source code. Manifest file is the other component of the APK. The component provides specifications for permission to the application’s needs, package, it’s flow, signatures, certificates, version codes and SHA-1 Digest. Libs is the other vital component for the APK. Lib is a directory that stores information for the application through jar files or codes. The asset component has a directory that files texts, fonts and audio. The different layout design for android applications are generally defined by the resource component of the APK. 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. Then an export APK is generated where the ones developing it sign in the app with a coded key. This is done to prove of their authority over the application. Uploading of the app in to the Google play store is done to allow users download it. The android package kit is the one that gets fitted to the mobile gadget when one downloads the app. APK MIRROR is the other online platform that provides clients to access android apps. Applications found in Google play store can be downloaded in the APK MIRROR. Having an account is not a requirement when one is using APK MIRROR to download android apps. High security measures are provided so as to provide highly trusted and original apps to the users in the play store during uploading and downloading of apps. Authorization of signatures and verification of certificates are some of the security measures. One advantage that comes with using APK MIRROR is the capacity to access earlier versions of an app.