Usability testing is a crucial aspect of UI/UX design that allows designers to evaluate the effectiveness and efficiency of their interfaces. By observing how users interact with a product or prototype, designers can identify any usability issues and gather valuable feedback for improvement.

One common approach to usability testing is conducting user testing sessions, where participants are given specific tasks to complete while their actions and feedback are recorded. Through these sessions, designers can identify pain points, uncover user expectations, and make informed design decisions.

For example, let's say we are designing a mobile banking app. During usability testing, we may observe that users struggle to find the option to transfer funds between accounts. This insight allows us to tweak the interface, making the transfer option more prominent and intuitive for users, thus enhancing the overall user experience.

Iterative design is closely linked to usability testing. It involves continually refining and improving designs based on user feedback. By iterating on designs, designers can address usability issues, incorporate new features, and enhance the overall interface based on real-user input. This process ensures that the end product is intuitive, user-friendly, and aligned with user expectations.

Remember, usability testing and iterative design are invaluable in the UI/UX design process. Embrace user feedback, iterate on designs, and strive to create exceptional user experiences!