Flat design has all the key attributes that make a site as functional as it is beautiful. It recognizes that a sense of familiarity is important to the user experience, but it creates this sense in a way that fits with the medium. At the same time, it's able to adapt to new discoveries, trends, and ideas. Flat design brings us a step closer to a new paradigm of digital design, where the functionality and aesthetic are in complete harmony.
Via Mario K. Sakata