Mobile Viral marketing and viral advertising refer to marketing techniques that use pre-existing social networks to produce exponential increases in brand awareness, through self-replicating viral processes, analogous to the spread of a computer virus. It can often be word-of-mouth delivered and enhanced online; it can harness the network effect of the Internet and can be very useful in reaching a large number of people rapidly.

The term "viral advertising" refers to the idea that people will pass on and share interesting and entertaining content; this is often sponsored by a brand, which is looking to build awareness of a product or service. These viral commercials often take the form of funny video clips, or interactive Flash games, an advergame, images, and even text.

The term "viral advertising" refers to the idea that people will pass on and share interesting and entertaining content; this is often sponsored by a brand, which is looking to build awareness of a product or service. These viral commercials often take the form of funny video clips, or interactive Flash games, an advergame, images, and even text.

Viral marketing is popular because of the ease of executing the marketing campaign, relative low-cost (compared to direct mail), good targeting, and the high and rapid response rate. The main strength of viral marketing is its ability to obtain a large number of interested people at a low cost.