What are Impressions?

Impressions is the number of times that the content is displayed. Therefore, impressions does not tell how many unique people saw the content, but how many times that the content has been displayed in total. For instance, even though the reach is 5.000, the content can have been displayed on the Instagram page of the audience multiple times, and have 8.000 impressions.

Difference between reach & impressions:

Reach is the number of unique visitors who saw the content. Impressions are the number of times the content is displayed.

Example: I watch a video once - the reach and impression are both 1.

                  I watch a video 5 times - the reach is still 1 while impressions is 5 now.