This article delves into the concept of the "IceCREAMberg," representing the hidden portion of website visitors that eCommerce marketers typically cannot target. It highlights statistics about the prevalence of anonymous website visitors and their potential impact on sales. The article discusses the differences between unique visitors and anonymous users and emphasizes the importance of engaging with anonymous visitors through personalized communication. It introduces Spotlight as a tool to identify and engage with anonymous visitors effectively, potentially converting them into loyal customers. The article concludes by advocating for strategies to reach and engage with the previously unseen 86% of website visitors to maximize marketing effectiveness and conquer the IceCREAMberg.