Every event has a default action. Event.preventDefault() as the name suggest is used to prevent this default action.The event.preventDefault() method is used to prevent the default behavior of an event from occurring. This is commonly used in web development when handling user interactions, such as clicking on a link or submitting a form.

By calling event.preventDefault(), the browser will not perform the default action associated with the event. For example, when a user clicks on a link, the browser will typically navigate to the URL specified in the link's href attribute. However, if you call event.preventDefault() on the click event of the link, the browser will not navigate to the URL, effectively preventing the default link behavior.

This can be useful in scenarios where you want to handle the event in a custom way, such as:

Form Submission: When a form is submitted, the browser will typically navigate to the URL specified in the action attribute of the form. By calling event.preventDefault(), you can instead handle the form submission using JavaScript.

Link Clicks: As mentioned earlier, you can prevent the browser from navigating to the URL specified in the link's href attribute, allowing you to handle the click event in a custom way.

Keyboard Events: You can use event.preventDefault() to prevent the default behavior of keyboard events, such as preventing the page from scrolling when the user presses the spacebar.
By using event.preventDefault(), you can gain more control over the user interface and enable more complex and interactive experiences on the web.

event.preventDefault() acts ask like return false in a method, by this the page don't get scroll up after clicking any button in the page.