Dark social refers to the sharing of online content through private channels such as direct messaging, email, or secure messaging apps, rather than through public platforms like social media. This type of sharing is not easily trackable by traditional analytics tools, making it difficult for marketers and businesses to accurately measure the reach and impact of their content. Dark social is often seen as a more intimate and personal form of sharing, as it allows individuals to share content with a select group of people rather than broadcasting it to a wider audience. This term highlights the hidden nature of online sharing and the challenges it presents for businesses trying to understand and harness the power of word-of-mouth marketing.