Ad Rotation Settings
All active ads in your ad group run equally, regardless of how each ad performs. Each ad will be eligible to show an equal number of times, but the actual impressions (how often each is actually shown) can be different. If ads in an ad group are unchanged for 90 days, the ad rotation in this ad group will automatically begin to optimize for either clicks or conversions. If the campaign is using Conversion Optimizer, it will optimize for conversions; otherwise it will optimize for clicks. Impressions are potential factor Google use to calculate a search campaign’s recommended daily budget.Rotate Indefinitely: Same as “Rotate evenly,” but will show ads for an indefinite amount of time, without optimization.Note: On your Ads tab, you can see the “% served” statistic showing how often each ad has been shown in relation to the rest of the active ads in the same ad group.
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If your ad rotation option is set to “optimize” and there are multiple variations of your text ads within the same ad group, AdWords will try to automatically show the best performing ads more often.Optimize for clicks (default setting): AdWords system will show best performing ads that are expected to get the most clicks based on past average Click Through Rates (CTR). Google will try to show these ads more often than other ads in your ad group to help you gain more clicks and impressions.Optimize for conversions: AdWords system will give preference to your ads that are expected to get the most conversions such as purchases and sign-ups. These ads will receive fewer clicks, but more conversions. If there is not enough data that tells which ad is likely to bring the most conversions, ads will rotate to optimize for