Sustainability is a global need, both for companies and people. It is not only a matter of convenience to achieve more excellent business benefits, but it is also accompanied by the concept of a smart city, which is of fundamental importance since it also goes in parallel with Industry 4.0. This chapter describes the technologies associated with the implementation of smart cities, benefits, limitations, and contribution to sustainability. Different examples of smart cities are described, highlighting the requirements for implementation and the associated risks. The amount and type of specific technologies available in implementing a smart city are striking. Sustainable cities and smart cities undoubtedly share many characteristics, so the interconnection of concepts facilitates implementation, knowing all the technological requirements necessary for development.

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