what is creativity?

Google results for creativity are about 72,000,000 and about 341,000,000 for creative. Yahoo results are higher: about 95,700,000 and 609,000,000 respectively. It seems a largely discussed matter. In fact, it is a sort of fashion matter. Looking for definitions we will find from American Heritage® Dictionary of the English Language:

adjective:
1. Having the ability or power to create: Human beings are creative animals.
2. Productive; creating.
3. Characterized by originality and expressiveness; imaginative: creative writing.

noun:
One who displays productive originality: the creatives in the advertising department.

other forms:
cre·ative·ly (Adverb), crea·tivi·ty or cre·ative·ness (Noun)

From answers.com we find precisely the definition above. If we search for creativity definition on dictionary.com we will get as follow:

–noun
1. the state or quality of being creative.
2. the ability to transcend traditional ideas, rules, patterns, relationships, or the like, and to create meaningful new ideas, forms, methods, interpretations, etc.; originality, progressiveness, or imagination: the need for creativity in modern industry; creativity in the performing arts.
3. the process by which one utilizes creative ability: Extensive reading stimulated his creativity.

Wikipedia definition is, as usual, deeper:

Creativity (or creativeness) is a mental process involving the generation of new ideas or concepts, or new associations between existing ideas or concepts.
From a scientific point of view, the products of creative thought (sometimes referred to as divergent thought) are usually considered to have both originality and appropriateness.

We can sum up all these definitions and condense it in as:
Creativity is the ability to achieve results that are original as well as suitable, concerning the context of application.