Which ad formats are not available on mobile devices?
Choose an answer
Tap an option to check your answer.
Correct answer: Overlay ads..
Why this is the answer
This format is not available on mobile because it is defined as a legacy placement that appeared on desktop only. Overlay ads sat on top of the video player rather than playing as an in-stream video unit. YouTube moved away from this format to prioritize ad experiences that work better across desktop and mobile environments. Mobile inventory instead supports video-first formats that fit the YouTube player experience on phones and tablets.
Pass your exam — without the endless answer hunt
Get every verified question and explanation for this exam in one place, and save hours of prep. 1,000+ certifications · 20+ languages · free to start.
Pass your exam faster → No card needed