Description: Focusing change refers to an event that occurs in user interfaces, especially in graphical user interfaces (GUIs), when the focus of attention shifts from one element to another. This focus change is crucial for user interaction, as it allows the system to recognize which element is active and, therefore, will receive user inputs such as taps or keyboard commands. Focus can be visualized through style changes of the element, such as a highlighted border or a color change, indicating to the user which element is selected. This mechanism is fundamental for accessibility, as it allows users to navigate the interface intuitively, especially on touch screens where keyboard use is limited. Moreover, proper focus handling can enhance user experience by facilitating navigation between different components of the application, such as buttons, text fields, and lists. In summary, focus change is an essential aspect of interface design that contributes to the usability and accessibility of applications across various platforms.