Video Ad Serving Template
Video Ad Serving Template is a specification defined and released by the Interactive Advertising Bureau 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, 1.1, 2.0, 2.0.1, 2.6, 3.0, 4.0, 4.1 and 4.2.
Request
In order to play a video ad in a video player, the video player sends a request to a VAST ad server.It is a simple HTTP based URL that typically appears as follows:
Response
The ad server responds with a VAST data structure that declares these parameters:- The ad media that should be played
- How the ad media should be played
- What should be tracked as the media is played
- The companion ad that should be displayed alongside the master ad
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