In website advertising, what is a common feature of display ads?

In the context of website advertising, display ads are designed primarily to help monetize website content. This form of advertising allows website owners to earn revenue by showing visual advertisements on their pages, which can include images, graphics, or animations. Display ads are typically placed prominently on websites to capture the attention of visitors and encourage them to engage with the ad's content.

The effectiveness of display ads in monetizing content lies in their ability to reach a broad audience and generate income through impressions or clicks. By integrating these ads into their platforms, content creators can offset costs associated with maintaining or developing their websites while providing free or lower-cost access to their content for users.

Conversely, some of the other choices do not accurately represent common features of display ads. For instance, requiring user registration to view ads is not a standard practice; display ads are generally accessible without such restrictions. Display ads also do not have to be video-based—their content can vary widely. Lastly, while display ads can contain text, they typically include visual elements and are not limited to textual information alone. Therefore, the role of display ads in monetization aligns strongly with the correct answer.