Flexible and complex targeting of the ads allows advertisers to develop an efficient campaign, as they are able to choose from a large number of different options like:

prioritizing campaigns

geographical targeting

time schedule targeting

frequency capping: a user can only see the ad for a limited number of times in a defined time period

This complex targeting also gives you the possibility of customizing your campaign to be shown or to be clicked an exact number of times, to extend your campaign with ten days if the total number of ads was not reached, etc.