Viral marketing is a phenomenon that emerged with the development of social media marketing; this study aims to provide information regarding the impact of viral marketing on the business world and enrich the literature related to the impact of viral marketing. A total of 20 journal articles relevant to viral marketing were selected and analyzed. The results of the review show that viral marketing has a positive impact on purchasing decisions for a product or service. It is important to provide entertaining, informative and credible messages in viral marketing content. This will result in high exposure. Research recommends driving viral marketing with a variety of digital marketing, such as websites, social media Facebook, Twitter, Instagram and blogs. Viral marketing is also capable of creating explosive growth in a short time, and is able to reach a very wide audience. During the Covid-19 pandemic, viral marketing was able to have an impact on online impulsiveness and trust.