# Callback

A function or notification invoked when a specified event or operation completes.

A function or notification invoked when a specified event or operation completes.

## An example

A service calls a configured endpoint when an eligible conversion is processed.

## Why it matters

Clarify whether the term means an in-process function or an external webhook; their failure and security models differ.


## Related terms
- [Analytics](https://jolts.xyz/resources/glossary/analytics)
- [Attribution](https://jolts.xyz/resources/glossary/attribution)
- [Conversion tracking](https://jolts.xyz/resources/glossary/conversion-tracking)
- [Raw data](https://jolts.xyz/resources/glossary/raw-data)

## Next step

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