Mobile advertising works best when ads match how people use their phones. Ads should load fast and show the message clearly within seconds. Short messages perform better because users scroll quickly. Images and videos should fit phone screens without looking stretched. Ads should also link to mobile-friendly pages so users do not get stuck. Targeting by interests or behavior helps show ads to the right users. Testing different ad versions helps improve results over time. What makes a mobile ad feel useful instead of annoying to viewers?