What are Metro style apps?

Metro Style Apps
Metro style apps are full screen apps tailored to your users’ needs, tailored to the device they run on, tailored for touch interaction, and tailored to the Windows user interface. Windows helps you interact with your users, and your users interact with your app. R

Your choice of programming languages
You can create your app in the languages you’re most comfortable with: JavaScript with HTML5 and CSS3, or C++/C#/VB with XAML.

New deployment method
Your users can safely and simply install your apps. Removal is just as safe and simple, and won’t lead to degradation of system performance over time.
1- Metro style app packaging: You package your apps for deployment as Metro style app packages. With Metro style apps, all apps are installed per user; they install, update, and uninstall cleanly; and they don’t change the operating system in an irreversible way.
2- Windows Store (not yet released)

New UI and touch-centered input
You can create apps with controls that put your users’ goals first, that support direct manipulation of UI elements.

Localization
You can develop your app once and deploy in multiple locales and multiple languages. Not only that, Windows Developer Preview provides an API that ensures your app responds to users’ language and cultural preferences—like date, time, number, and currency formats—with little to no effort on your part. The end result is a great app with a coherent cultural experience tailored to each user and to all users everywhere. Learn more about Globalizing your app.

Developer tools
With free versions of Microsoft Expression Blend and Microsoft Visual Studio 11 Express for Windows Developer Preview, you get a development environment and templates that help you design, develop, package, debug, and deploy your app.

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