We show the daily breakdown of the number of impressions for your Instagram Professional account's (Business/Creator) posts.
Impressions are the total number of times the profile's posts (i.e. posts, stories and promotions) have been viewed. It includes ad activity generated through the API, Facebook ads interfaces, and the Promote feature. It does not include profile views.
Impressions could be confused with reach - while impressions represent the total number of times posts have been seen, reach represents unique viewers of your post(s). Therefore, impressions could be higher than reach and it means some people have seen your post(s) multiple times.