The term "onFocus" refers to an event in programming, particularly in web development, that occurs when an element, such as an input field or button, gains focus. This means that the user has clicked on or navigated to that element, allowing them to interact with it. The "onFocus" event is commonly used in languages like JavaScript to trigger specific actions, such as highlighting the field or displaying additional information. In user interface design, utilizing the "onFocus" event can enhance user experience by providing immediate feedback. For example, when a user clicks on a text box, the background color may change, indicating that the field is ready for input. This helps users understand where they are in a form or application, making navigation smoother and more intuitive.