A user-interface that is easy to use is considered to be:

🧠 Explanation:

A user-interface that is easy to navigate, understand, and operate is called user-friendly. The term indicates that the software or system is designed keeping the user in mind, reducing complexity and improving efficiency. Grammatically, “user-friendly” is an adjective describing the interface. Such interfaces typically have clear menus, intuitive controls, helpful prompts, and consistent design elements. Alternatives could include easy-to-use, intuitive, or accessible, but “user-friendly” is the standard term in computer science and technology contexts. For PPSC exams, recognizing this term is important as it highlights software design principles that enhance user experience.