Preventing default browser behavior is essential when you want to handle events with custom logic instead of letting the browser perform its default action. As the creator of CoreUI, a widely used open-source UI library, I’ve used preventDefault extensively in form validation, custom navigation, and interactive components. From my expertise, the preventDefault() method is the standard way to stop default actions like form submissions, link navigation, or key presses. This approach gives you complete control over user interactions while maintaining accessibility.