Ad Scheduling: Ads are queued to run at specific times or under certain conditions to match the campaign strategy.

Inventory Management: Ads wait in the queue when ad slots are limited, ensuring fair distribution across campaigns.

Targeting and Optimization: Ads are queued to align with the most relevant audience segments at the best times.

Compliance and Approval: Ads might be queued while awaiting final checks to meet platform standards.

Technical Coordination: Server loads, system updates, or integration issues can cause queuing.

Budget and Bid Adjustments: Ads are queued based on real-time bidding and budget considerations to optimize spend and performance.