Referral traffic refers to visitors who arrive at a website through links from other sites, rather than through search engines or direct visits. This type of traffic is important for website owners because it can indicate the effectiveness of their marketing efforts and partnerships. For example, if a blog mentions a product and includes a link to the product's website, any visitors who click that link contribute to referral traffic. Tracking referral traffic helps businesses understand where their audience is coming from and which sources are most effective. Tools like Google Analytics can provide insights into referral sources, allowing website owners to optimize their strategies and build stronger relationships with affiliates or partners.