Visibility of system status is a core principle of user-centered design. It means that a system should always keep users informed about what is going on through clear and understandable feedback. This can include visual indicators, progress bars, sound cues, or text messages. Transparent feedback increases user trust, supports orientation, and enables informed decision-making. Especially in interactive applications, status visibility ensures that users always know the current state and can respond accordingly. It is essential for effective, safe, and pleasant system use.