Key principles include simplicity, consistency, clarity, responsiveness, and accessibility. Effective interface design strives to minimize cognitive load, provide clear visual cues and feedback, maintain consistency across the interface, and adapt seamlessly to different devices and screen sizes.

Interface design plays a significant role in shaping the overall user experience by creating intuitive and visually appealing interfaces that enhance usability, facilitate task completion, and evoke positive emotions. A well-designed interface can improve user satisfaction, retention, and brand perception.

Common tools include design software like Sketch, Adobe XD, Figma, and Adobe Photoshop for creating visual designs and prototypes. Techniques such as user research, wireframing, prototyping, and usability testing are also essential for designing interfaces that meet user needs and preferences effectively.