Social Media Impressions
Number
Counts the number of times content has been displayed on someone's screen. Note that this doesn’t mean it was clicked, just that it was displayed. Impressions give you an idea of the potential reach of your content. A high number of impressions suggests that your content has a wide audience, but it doesn't necessarily mean high engagement.
Example
If a post shows up 20,000 times on various users' screens, it has 20,000 impressions.