Cognitive surplus results when leisure time and available tools allow us to engage in creative acts. It is a term that was introduced by Clay Shirky which pertains to the synthesis of the excess of people's energy, time and creativity leading to productivity sharing and creation.
Data backup and collaboration.
That it is a tool that does its job well, it's a technology that works.
Digital network, as it refers to the series of connected and linked computing devices into a network as described in this question.
