Which of the following is NOT a common digital media format?

In the context of digital media, the distinction lies in the formats that primarily exist in digital environments versus traditional media. Display ads, video ads, and social media ads are all formats specifically designed for digital platforms, utilizing internet technologies to deliver content to audiences. These formats engage users directly through websites, social media networks, and video streaming services, making them integral to digital marketing strategies.

On the other hand, radio ads are rooted in traditional media and primarily delivered through audio broadcasts on terrestrial radio stations. While there may be some digital elements associated with radio advertising, such as streaming radio services or podcasts, radio ads themselves are traditionally recognized as part of the audio medium rather than a digital format per se. Therefore, identifying radio ads as not commonly associated with digital media formats makes sense in the context of this question.