What is ad stacking?

Ad stacking refers specifically to the practice of placing multiple ads in a single ad placement on a webpage. This technique can create a scenario where users are shown several ads one on top of the other in the same spot without having the opportunity to engage with each ad individually. The ads may not be fully visible, and the user may see only the topmost ad or be unable to interact with the others, which can lead to a frustrating user experience and raise concerns about ad transparency and performance metrics.

This practice is not just a technical layout decision; it carries implications for advertisers regarding ad visibility and effectiveness, as well as potential violations of advertising standards or agreements. Since it does not involve the distribution of ads across multiple placements, nor does it pertain to adjusting sizes or controlling timing, it distinctly defines ad stacking within the realm of digital advertising strategy.