Standards
VAST (Video Ad Serving Template) — Definition & Explanation
An IAB standard (currently v4.2) that defines the communication protocol between video players and ad servers. VAST specifies how video ads are requested, served, tracked, and displayed within video content.
How VAST (Video Ad Serving Template) Works
When a video player needs an ad, it calls a VAST URL which returns an XML document describing the creative (media file URL, tracking pixels, skip behavior, duration). The player parses the VAST and displays the specified video creative.
Why VAST (Video Ad Serving Template) Matters for Publishers
VAST is required for all programmatic video advertising. Publishers implementing VAST-compatible video players can access premium video CPMs of $8-50+.
Frequently Asked Questions
What version of VAST should publishers implement?
VAST 4.2 is the current standard. VAST 3.0 remains widely supported. Publishers should support both for maximum demand compatibility.
What is the difference between VAST and VMAP?
VAST defines a single ad break. VMAP (Video Multiple Ad Playlist) defines a schedule of ad breaks for longer video content.
Does Stellor Media support VAST video delivery?
Yes. Stellor Media supports VAST 3.0 and 4.x for both outstream and in-stream video formats.
Related Terms
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