Are you using an android device? If you do, perhaps you're still on the lookout for some awesome applications to be installed on your device. The fastest way of filling that device of yours with apps is by downloading free apps in the android market. Basically, this is owned by Google and it is a marketplace that is filled with all kinds of interesting applications, themes, useful utilities similar to calculators and of course, entertaining applications like games readily available for download.
Majority of these apps are downloadable for free. Some on the other hand require users to upgrade them in exchange of a small fee if you like to get accessibility to more advanced features.
Not like traditional software, you don't have to download files and install the applications on your device. Just open a Google account and you can access the android market easily. You may even access it through a web browser or perhaps, use the android market app, but what's the difference? As a matter of fact, the market application helps in organizing all apps while making the downloads a lot faster as well.
The sad thing is that, not everyone could have access in the android market. To give you an example, some of the smart phones today don't come with preinstalled market app and therefore, preventing users to have access to the market through the app. Others might wish to install an older ver. of a working application but they just can't find it anymore. In these instances, they have to do android APK download. Know more about APK at http://community.wikia.com/wiki/Help:Community_Apps.
APK GameKiller files actually work in the same manner as what EXE files do. If you have a computer, you're surely familiar with EXE or Executable files. Normally, this is what used to launch the software's installer. APK file on the other hand works on the same principle. When you like to install software onto your android device, you have to launch the APK file through a file browser. Of course, be sure that you allow the unknown sources in your phone's settings.
As a result of security reasons, users are prohibited to install APK files because such files may inflict damage to the device causing it to malfunction. For example, unofficial application might be so buggy that it keeps making the device to crash. Needless to say, you don't want this to happen so make sure that you're download apks files only from trusted and known sources. Alternatively, you may wait for other users to try the APK files on their smart phones before trying it on your own.