An interface (or user interface) is the point where humans and electronic devices communicate with each other. This may include hardware like screens, keyboards, and mice. On the less tangible spectrum, an interface encompasses graphical user interfaces (GUIs, basically graphics that users manipulate to accomplish tasks) for apps and websites, design elements, navigation structures, and other interactive components that empower users to engage effortlessly with digital platforms.

Though artistic principles play a role in interface design, the ultimate test of an excellent interface is the user experience. If users find the interface hard to use, no amount of fancy shapes and colors can help the interface succeed in attracting and retaining users.  

Ultimately, an excellent interface design leverages art, psychology, and user-centered engineering to ensure that human-device interactions are intuitive, visually appealing, and efficient, fostering a sense of ease and satisfaction.

Benefits of excellent interface design

• Sustainable income from digital products. Developers and organizations relying on applications and websites for growth and income find immense value in a polished and easy-to-use interface. A good interface enhances engagement, satisfies users, and boosts app retention, ultimately translating to revenue growth.
• Adaptability. A responsive interface ensures a seamless user experience across diverse devices and network conditions, broadening the user base of digital products like apps and websites. A large pool of active and loyal users is especially important for ad-dependent app monetization models.