UX/UI design plays a crucial role in building websites by ensuring a seamless, user-friendly, and visually appealing experience. User Experience (UX) design focuses on enhancing usability, accessibility, and functionality, making navigation intuitive and efficient. It involves research, wireframing, and testing to optimize user interactions. User Interface (UI) design, on the other hand, emphasizes the visual elements like layout, typography, colors, and interactive components to create an aesthetically pleasing and engaging interface. Together, UX/UI design improves user satisfaction, increases engagement, and helps businesses achieve their goals by making websites more effective and conversion-friendly.