Dynamic User Interfaces (DUIs) are interactive systems that adapt in real-time to user inputs and preferences. Unlike static interfaces, which remain fixed, DUIs can change layout, content, and functionality based on user behavior, making them more engaging and personalized. This adaptability enhances user experience by providing relevant information and tools as needed. These interfaces often utilize technologies like JavaScript, HTML5, and CSS3 to create responsive designs. Features such as animations, real-time updates, and customizable elements are common in DUIs. Popular applications include websites, mobile apps, and software programs that aim to improve usability and accessibility for diverse users.