Customizing pagination controls in Grid.js allows you to create a more intuitive and visually appealing user experience when displaying large datasets. By default, Grid.js provides basic pagination controls, but you can modify these controls to better fit your application's needs. You can customize the navigation buttons (such as next and previous), change the labels for these buttons, and adjust the appearance using custom CSS. Additionally, you can modify how the page numbers are displayed, making it easier for users to navigate through data. These customizations help users quickly find the information they need and make the table feel more integrated with your site's overall design.