This chapter analyzes the relationships that cities have with digital technologies. Smart cities are at the crossroads between the development of information and communication technologies in the city, and the affirmation of a new paradigm of sustainable urban development. To assess the social impact of smart cities on citizens, an empirical study was needed. The study and analysis of the data allowed measurement of the level of interest and sensitivity of citizens, to know the connected people who use new technologies, to collect the opinions of the inhabitants and users of the city to identify the main needs, and to improve the comfort of the inhabitants while having more efficient transport. This study has enabled the formation of future projections so that all citizens benefit from the powers of smart cities.