Shadow DOM is a web standard that enables encapsulation of a component’s internal document object model (DOM) structure and styles. By creating a 'shadow tree' attached to a regular DOM element, it isolates the component’s markup and CSS from the rest of the page. This prevents external scripts and styles from accidentally or maliciously affecting the encapsulated content. In cybersecurity, Shadow DOM can be leveraged to obscure code, making it harder for attackers to analyze, manipulate, or exploit certain page elements. However, it can also introduce security concerns if used to hide malicious scripts or phishing elements from security tools and users. Understanding Shadow DOM is important for both web developers and security professionals.