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

# Campaigns

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  <img src="https://mintcdn.com/criteo-e1682996/JUXl4tN6qP1utg1F/images/retail-media/v2025.01/docs/1f0bfaf-l2-campaign.png?fit=max&auto=format&n=JUXl4tN6qP1utg1F&q=85&s=e690cb9c25df72cd19c273e14a467dd9" alt="" width="1886" height="1015" data-path="images/retail-media/v2025.01/docs/1f0bfaf-l2-campaign.png" />
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## Open Auction Campaigns

An Open Auction campaign operates on a first-price auction model using cost-per-click (CPC). Advertisers set their bid for each shopper interaction with their ad, competing in an inventory auction to secure ad placements.

💡 **Things to Know**

* A campaign represents a marketing objective and includes line items.
* Campaigns can contain line items across multiple brands and retailers.
* Campaigns offer optional controls for budgeting and attribution windows.
* Budgets can also be managed at the line item level.
* Various [reports](/retail-media/v2025.01/docs/demand-side-analytics-get-started) are available to track and measure campaign performance.
* Accounts are capped at 100,000 active campaigns.
* Currently, only Open Auction campaigns are supported via the API.

## Quick Start

1. **Select products** to promote from your account catalog.

2. **Create a campaign** to define your marketing objective.

3. **Create a line item** within the campaign.

4. **Add products to the line item** to specify what you are promoting.

5. **Assign the campaign** to an account balance to manage spending.

6. **Activate your line item** to start running the campaign!