There's a deal of information available about creativity these days. Creativity is a peculiarly human attribute: an infinite number of monkeys given an infinite amount of time would ultimately, by the laws of probability, duplicate The Sistine Chapel ceiling, but that would be a random outcome, a chance happening, not a work of art.
Scientific analysis is finally starting to help us understand how our brains work. Some of the complex patterns of neural activity firing inside that mysterious three pounds of flesh can be viewed as the collaborative effort which precedes creative thought.
My own musings have given me a personal definition: creativity is imagination made manifest. We take our ideas, then make them tangible. We move from abstract to concrete. A mathematician shows us patterns with numbers. An author tells us stories with words. A child makes sandcastles on a beach.
Thus we are all creative. Creativity is a fundamental facet of our nature. The joy of the Internet is that we can share our creations with others so freely, so immediately and so widely that we can now see so very clearly that creativity is no longer the preserve of a privileged few elite who are labelled as "artists". As individuals we are certainly all placed differently on a spectrum of skills, ability and talent, but that's true for just about everything worthwhile to which we aspire in life.
So go on: create something today. You'll make the world a better place simply by doing so.