Which format is NOT part of the IAB Display/Desktop Rising Star Ads?

The choice of rectangle as the format that is not part of the IAB Display/Desktop Rising Star Ads is accurate because the IAB has defined specific ad formats categorized under the Rising Stars initiative to promote more engaging and interactive ad experiences. The Rising Star formats include innovative designs that allow for greater creativity and user engagement, such as Billboard, Portrait, and Slider.

The Billboard is a large, prominent format that can accommodate rich media and is designed to grab attention. Portrait is a tall and narrow format that is optimized for mobile viewing but also fits well on desktop environments, allowing for a more immersive experience. Slider ads are dynamic, interactive formats that can slide in and out on the page, providing a unique way to capture user interaction.

In contrast, the Rectangle format, while a widely used display format in digital advertising, does not fall under the Rising Stars initiative. It typically lacks the interactivity and design innovation that the Rising Stars formats emphasize. This distinction is crucial for understanding the IAB's focus on enhancing the visual and functional quality of online advertising through specific recommended formats.