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What Are Popunder Ads? How They Work and Why They're Still Effective in 2025

Popunder remains one of the most effective and high-performing ad formats in 2025 — and it’s not going anywhere. Despite being around for years (and often underestimated), it still drives reach, traffic, and conversions for advertisers across the globe. In this article, we’ll walk through why popunder ads still perform, how to use them right, and when they deliver the best ROI.