The role of a user interface (UI) designer is to create visually appealing and user-friendly interfaces for applications and websites. They focus on layout, color schemes, and typography to ensure a cohesive look and feel that aligns with user experience (UX) principles. UI designers collaborate with UX designers, developers, and clients to understand user needs and implement designs that enhance usability. Their work significantly impacts how users interact with products, distributing information clearly and efficiently.