> ## Documentation Index
> Fetch the complete documentation index at: https://guide.daro.so/llms.txt
> Use this file to discover all available pages before exploring further.

# Create an Ad Unit

> Create ad units for each ad format. Register your app before creating ad units.

Create an ad unit:

1. Navigate to **Ad Units** and click **Add Ad Unit**.

<img src="https://mintcdn.com/delightroom-5a71a6a8/j3-znW7LKrbpP3mb/how-to-use/img/create-ad-unit-detail_en.png?fit=max&auto=format&n=j3-znW7LKrbpP3mb&q=85&s=ed10940d47aa79cd38ebee364e53913c" alt="/how-to-use/img/create-ad-unit-detail.png+_existingInIndexedDbMintlify" width="1160" height="1026" data-path="how-to-use/img/create-ad-unit-detail_en.png" />

2. Select **Ad Format** and enter **Ad Placement** name. DARO generates an **Ad Unit Name** automatically (`app_package_name_os_ad_format_ad_placement`). To customize, select **Enter Manually**.

   <Tip>
     **Naming best practice**: Use lowercase with underscores: `appname_os_adformat_placement`

     Example: `daro_ios_interstitial_main_home`
   </Tip>

3. Optionally, set minimum eCPM (disabled by default).

   <Warning>
     **About minimum eCPM**: DARO optimizes eCPM automatically based on performance and demand. Setting a floor may temporarily boost revenue but can reduce long-term earnings by limiting buyers. Use carefully.
   </Warning>

## Important Notes

* Maximum **20 ad units** in Live status per app
* Create one ad unit per placement
* Only create ad units you'll integrate—unused units affect optimization