Unique Clicks
The number of users that have clicked on your ad.
Unique Reach
The number of people that have seen your ad.
Impressions
How many times your ad has been viewed.
CPC (Cost per click)
The average cost of each click.
CPM (Cost per thousand impressions)
The average cost per thousand impressions.
CTR (Click through rate)
The percentage clicks per impression.
Frequency
On average how many times your ad has been viewed by the same contact.