What unique feature does a Billboard ad include for user interaction?

A Billboard ad is designed to capture user attention while still allowing for a level of user control and interaction. The inclusion of a close button is significant because it empowers users to manage their browsing experience according to their preferences. This feature is particularly important in digital advertising, where user experience is a key factor; allowing users to dismiss an ad helps prevent frustration and enhances the likelihood of a more positive engagement with the content on the page.

In contrast, while fading in and out can be a visually appealing effect, it does not necessarily promote or enhance user interaction. Similarly, playing audio upon hovering might attract attention, but it can also lead to annoyance and does not involve the user actively deciding how to interact with the ad. Lastly, an ad that requires no user interaction fundamentally contradicts the concept of engagement, which is central to the purpose of more interactive formats like Billboard ads.