Viral marketing is a way to promote a service or product exponentially. It’s an effective internet marketing tool designed for one reason – to gain traffic through free or low cost distribution with the intent of gaining the customer to market other products and create brand awareness. Free, as in giving away as a bonus or incentive in conjunction with something else. For instance, I can create a handy E-book that is exclusive and likeable and then give it away free as a promotion or incentive to sign up for my newsletter. You can even sell it.