Prior to Windows 10, you could develop applications for Windows desktops, tablets, phones, Xbox, and embedded devices, and usually you had to use different approaches for each type of device. For example, to develop modern Windows 8.x applications, you had to use Windows Runtime. To develop Windows Phone 8.x applications, you had to use Silverlight and, later, Windows Runtime. To develop Internet of Things (IoT) applications for Galileo boards, you needed to use C++ and a subset of the Win 32 API; Xbox application developers were required to have access to a special private SDK. Therefore, it was not easy to develop something universal for all Windows devices. Additionally, Microsoft introduced Stores for Windows and Windows Phone, and developers had to support these two different Stores instead of just one.
The Windows 10 release changed everything. Today, when we talk about Windows 10 modern applications, we mean applications that work on desktops, tablets, Xbox, phones, HoloLens, and IoT devices. As you read this book, you will learn how to develop applications for all of them and publish your applications to the Store, at least for desktops, tablets, and phones. Let's see how you can do it.