Viral origin of the virus, meaning it works like virus. Once infected it will spread and spread more widely. And can also be interpreted as word of mouth marketing strategy. In the context of internet marketing, this can be done in various ways / methods depending on the webmaster's own creativity.
Of course viral marketing can increase traffic. See the case of Facebook and Twitter, I think you were affected by the viral marketing, right?
Increase in the amount of traffic can increase sales, or depending on how you captivate visitors.
