Hits mean - how many times AdPlexity detected an ad, during the specific time frame (based on your selection).
​

Hits in the Global stats are all the hits recorded since the first time AdPlexity detected that specific ad. So, the ad in the example below was first detected 1096 days ago (that means it's active since then), and it was detected 3217497 times in that 1096 days since today.
​

Occurrences are the number of hits detected per day.
​