Unique opens or unique clicks refer to the first time a subscriber opens a newsletter or clicks on a link within it. This number is included in the total count of all opens or clicks. The number of unique opens or clicks indicates how many individual subscribers have opened the email or clicked on a link at least once. If a subscriber opens the email or clicks on a link a second or third time, these actions are only counted in the total number of opens or clicks.

In summary, the unique count represents the number of individual subscribers who have opened the email at least once, while the total count includes all opens and clicks, including multiple actions by the same subscriber.