# Install

Adding an application to a device; advertising measurement often uses a first-open signal as an observable proxy.

Adding an application to a device; advertising measurement often uses a first-open signal as an observable proxy.

## An example

A downloaded app reports its first launch to an eligible measurement system.

## Why it matters

State whether a report counts downloads, installations or first opens. They are not identical events.


## Related terms
- [Attribution](https://jolts.xyz/resources/glossary/attribution)
- [Device ID](https://jolts.xyz/resources/glossary/device-id)
- [Mobile measurement partner (MMP)](https://jolts.xyz/resources/glossary/mobile-measurement-partner)
- [Privacy thresholds](https://jolts.xyz/resources/glossary/privacy-thresholds)

## Next step

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