Cross-device tracking in Adobe Analytics is a powerful tool for businesses that want to gain a better understanding of their customers' behavior across multiple devices. By tracking user activity across multiple devices, businesses can gain insights into how customers interact with their products and services, as well as how they move between devices. This information can be used to optimize marketing campaigns, improve customer experience, and increase conversions. Knowing how to use cross-device tracking in Adobe Analytics can help businesses gain a better understanding of their customers and make more informed decisions.