# Video Ad Serving Template (VAST)

An IAB Tech Lab specification for communicating video-ad assets and related instructions to video players.

An IAB Tech Lab specification for communicating video-ad assets and related instructions to video players.

## An example

A video player reads a VAST response to locate an ad asset and permitted tracking events.

## Why it matters

A VAST response is not a guarantee of playback, viewability or a compatible asset on every device.

## Reference

[IAB Tech Lab VAST specification](https://iabtechlab.com/standards/vast/).


## Related terms
- [Ad placement](https://jolts.xyz/resources/glossary/ad-placement)
- [Call to action (CTA)](https://jolts.xyz/resources/glossary/call-to-action)
- [Impression](https://jolts.xyz/resources/glossary/impression)
- [Native advertising](https://jolts.xyz/resources/glossary/native-advertising)

## Next step

[Explore advertising](https://jolts.xyz/advertisers) or [monetize your AI app](https://jolts.xyz/publishers).