VAST stands for Video Ad Serving Template. It is a standard XML-based protocol developed by the Interactive Advertising Bureau (IAB) to facilitate the communication between video players and ad servers to deliver video advertisements.

VAST provides a standard format that allows ad servers to deliver video ads to various video players or platforms, ensuring compatibility and ease of integration. It defines the structure and content of the ad response that the video player should expect from the ad server. This helps streamline ad delivery and enables publishers to monetize video content more efficiently.

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