What is creativity?

First of all, what is creativity? I like the definition from Linda Naiman,
"I define creativity as the act of turning new and imaginative ideas into reality. Creativity involves two processes: thinking, then producing. Innovation is the production or implementation of an idea. If you have ideas, but don't act on them, you are imaginative but not creative."

Above definition is consistent with the idea of a creative product in Defying the Crowd, by Sternberg & Lubart

“A product is creative when it is (a) novel and (b) appropriate. A novel product is original not predictable. The bigger the concept, and the more the product stimulates further work and ideas, the more the product is creative.”