A DoubleClick for Publishers feature that helps you:
- Limit how often a line item is served to the same user.
- Specify the number of impressions that will be delivered to a single user in a specific period of time.
- Specify time ranges in minutes, hours, days, weeks, or months. You may also specify a lifetime cap.
- Apply multiple rules. For example, you can set a frequency cap limiting the same user to one impression per day and three impressions per week.