APKinstall is a free web service that helps you do one thing. With it you can very easily install any Android app (.apk file) download into your computer without transferring them to your Android device via USB. I think, new android users can benefit much from this service.
APKinstall created by XDA forum member htc-hd2 allows anyone with a web browser to effortlessly install any apk file (android app) with a very simple 3 step process.
The process is like this: Select an .apk file you want to install from your computer and upload it. It’ll display a QR Code. Point your Android camera to the given QR Code and scan it. Now using a Wi-Fi or 3G network you can download it on your Android device.