The main goal of user interface (UI) design is to enhance the user experience by creating interfaces that are easy to use, visually appealing, and intuitive. Effective UI design focuses on optimizing the layout, navigation, and overall functionality to ensure users can interact with software applications efficiently. It involves understanding user needs and behaviors, which is crucial for providing a seamless interaction and fulfilling users' objectives. A well-designed UI contributes significantly to user satisfaction, retention, and productivity.