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The 21st century is going to be the age of cities. More than half of the world population lives in one. Cities are pioneers in testing and implementing innovative solutions to design greener, more efficient, and better places. They are spaces in which data is created and gathered in great numbers, which poses new challenges regarding privacy and security, as well as it opens new opportunities to improve social inequalities. The great challenge is not to leave anyone behind. New technologies are influencing greatly on how cities are built and managed.The digital and the physical worlds are interconnected forever.