VAST (Video Ad Serving Template) is a specification defined and released by the Interactive Advertising Bureau (IAB) that sets a standard for communication requirements between ad servers and video players in order to present video ads.
It is a data structure declared using XML.
VAST has 8 versions: 1.0 (deprecated), 1.1 (deprecated), 2.0, 2.0.1(The schema version as the official VAST 2.0 schema), 3.0, 4.0, 4.1 and 4.2.
To play a video ad in the video player, the video player sends a request to the VAST ad server.
The ad server responds with a VAST data structure that declares these parameters:
- Advertising media that should be played How should advertising media be played?
- What to watch while playing media?
- The companion ad should be displayed with the main ad
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