An ad unit in Ad Manager is space on a webpage where ads can serve via ad tags. Ad units have one of two types of sizes: standard sizes and video sizes. Standard sizes represent regular display ad slots. Video sizes represent video players on a page that can show VAST (Video Ad Serving Template) ad responses.
Components of a video ad unit
A video ad unit is an ad unit that contains at least one video size.
- One master video size (such as 400x300v). The master video size represents the video player size on the page. In Ad Manager, the letter "v" appears automatically at the end of any video size, indicating that it's a video size and that it's capable of playing back videos sent in the VAST format.
- One or more companion ad sizes to run alongside the master video size.
- Other non-video sizes, such as a banner at the top of the page.
An example of a page containing all of these components might be a page with a "300x400v" video ad slot that plays the master video ad, a "300x250" companion ad slot, and a standard "728x90" display ad.