The Event.preventDefault() method in JavaScript is used within event handlers to prevent the default behavior associated with an event from taking place. When an event occurs, such as a click on a link or the submission of a form, there is often a default action associated with that event. preventDefault() allows developers to stop this default behavior from happening.

Common use cases for preventDefault() include:

• Form Submission: Preventing the default form submission behavior allows developers to handle form data using asynchronous techniques (e.g., AJAX) or to perform client-side validation before submitting the form.
• Link Clicks: When dealing with navigation links, developers might want to perform some actions on the page dynamically without navigating to a new URL.
• Key Events: For certain key events, such as the Enter key in a form input, preventing the default behavior can be used to control whether a form is submitted or not.