Viral marketing, just like any type of online marketing campaign, aims to drive as much traffic to a site as possible. It actually leverages on the numbers game: the more traffic that ends up at your site, the higher the possible number of conversions.
Of course a viral marketing campaign has to work hand-in-hand with other aspects of the page in order to convert visitors. Read more about that here.
But what actually is viral marketing and how can you formulate a campaign yourself to help drive traffic to your store?