The significance of User Interface (UI) design lies in its impact on the overall user experience when interacting with software products. UI design focuses on creating visually appealing, intuitive, and functional interfaces that facilitate navigation and interaction. A well-designed UI enhances usability by minimizing confusion and ensuring that users can efficiently accomplish tasks. Good UI design considers elements like layout, color schemes, typography, and iconography to create an effective communication layer between the user and the product. Ultimately, thoughtful UI design contributes to user satisfaction and retention.