# ads.txt and app-ads.txt

Publisher-hosted files that declare authorized sellers of a website's or app's digital advertising inventory.

Publisher-hosted files that declare authorized sellers of a website's or app's digital advertising inventory.

## An example

A buyer checks whether the seller offering inventory is listed by the publisher.

## Why it matters

These declarations help supply-chain verification but do not certify every impression as genuine or suitable.

## Reference

[IAB Tech Lab ads.txt specification](https://iabtechlab.com/ads-txt/).


## Related terms
- [Publisher](https://jolts.xyz/resources/glossary/publisher)
- [sellers.json](https://jolts.xyz/resources/glossary/sellers-json)
- [Supply-side platform (SSP)](https://jolts.xyz/resources/glossary/supply-side-platform)

## Next step

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