This software is called emulators and they allow you to run those android applications on your Windows or Mac easily without any trouble. There is a way around that as well, and now you can run your favorite android applications on your PC or laptop. But the only difficulty you can find is that you cannot use these apps on any other platform. That is one of the main reasons that you can find millions of android apps that are small in size and are a perfect way to get the things done for you. It is supported by thousands of phones and almost all major smartphone brands. Android is the fastest emerging OS in the world.