I had heard about popunders before, but I thought they were an outdated format. Everything changed when I started promoting a gambling offer in a non-standard geo and the usual methods were not giving results. I started digging deeper and came across an article that explained what are popunder ads and how they really work. There were also tips on frequency, formats and creatives. I decided to try it — and the traffic started converting! The main thing is not to overdo it with the aggressiveness of the display.