Definition:
Windows Runtime, or WinRT, is a platform-homogeneous application architecture on the Windows 8 operating system. WinRT supports development in C++/CX (Component Extensions, a language based on C++) and the managed languages C# and VB.NET, as well as JavaScript and TypeScript.
Let's start with Windows Runtime apps. A Windows Runtime app is an app that uses the Windows Runtime and runs on a Windows device (such as a PC or tablet) or a Windows Phone. We call a Windows Runtime app that runs on PCs, laptops, and tablets a Windows Store app. We call a Windows Runtime app that runs on the Windows Phone a Windows Phone Store app.
