Definition of a 'Smart City'

Looking for the definition of a "Smart City", you can find different descriptions of this vision:
"Smart cities 6 axes model: smart economy, mobility, environment, people, living, governance." or "Smart City: Investments in human and social capital and traditional (transport) and modern (ICT) communication infrastructure fuel sustainable economic development, a high quality of life, with a wise management of natural resources, through participatory governance." and many others.

Information and communication technology plays an important role in all of them. The Silicon Valley - still the heart of innovation in the ICT industry - is the right place to get in touch with new ideas, products and companies.