An Unique Click means any number of clicks on any Link inside a campaign email, by a single subscriber, made within one hour counted from the first click, which means that if several clicks happen in one single e-mail within one hour since the first click occurred, only one unique click will be considered.

Emailbidding uses only unique clicks for its performance measurements. We do this because we believe this is the only fair way to present good quality results to our advertisers.

Check also billable unique clicks in “What are Billable Unique Clicks?