What is Metro?
Metro is the name of the new design language created for the Windows Phone interface. When given the chance for a fresh start, the Windows Phone design team drew from many sources of inspiration to determine the guiding principles for the next generation phone interface. Sources included Swiss influenced print and packaging with its emphasis on simplicity, way-finding graphics found in transportation hubs and other Microsoft software such as Zune, Office Labs and games with a strong focus on motion and content over chrome.
Not only has the new design language enabled a unique and immersive experience for users of Windows Phone; it has also revitalized third party applications. The standards that have been developed for Metro provide a great baseline, for designers and developers alike. Those standards help them to create successful gesture-driven Windows Phone experiences built for small devices.