One type of YouTube ad is an in-stream video ad. These ads appear before, during, or after related videos on YouTube. In-stream video ads are usually six seconds long and will play once per hour on average. Another type of YouTube ad is a pre-roll video ad. These ads play before a video on YouTube and are usually 30 seconds long or shorter. Pre-rolls are also called "YouTube Ads" because they only run on the platform and they're labeled as such in the player with text that reads “sponsored by” followed by the company that paid for it.
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