Definition: An ad is a message served on publishing sites and it can be in any format: image, textlink, Flash, movie/audio clip, HTML code (RichMedia ad)
Relationship: An ad could be linked to multiple zones and multiple campaigns.
Similar terms: creative, banner, advert, advertisement
Who is a Publisher? "Definition: Publishers operate websites and generate revenue from selling ad inventory/space to advertisers. Relationship: A publisher may have multiple zones,..." 25% relevant in About AdSpeedGetting Started
Click-Thru Rate (CTR) "Definition: CTR measures the performance of an ad/creative and has this formula CTR = (Clicks/Impression) x 100 Example: a 1.0%..." 22% relevant in ReportingStatistics Reports