If a business can build a successful Viral Marketing strategy, it will bring a huge amount of backlinks, completely free, and quality to the website. This is an important factor that greatly affects the SEO process of the business. Clicks from Viral Marketing to the website will increase traffic and the reputation of the website. This supports the SEO process to quickly reach the top of Google. SEO also affects Viral Marketing, helping users access the campaign through search engines. When your content hits the customer's psychology, it will encourage users to share more. When implementing a marketing campaign, businesses need to combine both SEO and Viral Marketing to promote products and sell.