What is xDB?

xDB, or the Experience Database, is a component of Sitecore Experience Platform (XP) that collects and stores interaction data from all channels (e.g., website, email, mobile) to create a comprehensive view of each customer. It's a NoSQL database designed to handle large volumes of data and is used for personalization, marketing automation, and analytics. xDB allows marketers to track customer behavior and tailor experiences accordingly.