1: In-stream ads,
Viewers have the option to watch the entire video, or to “skip” after 5 seconds. There are no limits for the duration of ads, but advertisers will be charged only if the user watches the video clip for at least 30 seconds or entire.
2: In-display ads,
Viewers have the option to click on your ad. The advertiser pays only when a user opens and starts watching the video.
3: In-search ads,
your ad appears in the search results during the search.
How YouTube charges for the ads ?
CPM (Cost per mile) – Payment for 1000 ad impressions.
CPV (cost per view) – Payment if the user has viewed the video until the end, or for at least 30 seconds.