Impressions
Impressions refers to the number of times a page is accessed over a fixed period of time. Thus if a page receives 1,000 impressions per day, then that page is accessed 1,000 over the course of the day. This term is often confused with hits, which is actually an incorrect use of this term (hits and number of impressions would be the same if the page was simply a text page with no additional files associated with it). Page impressions also equals the number of times an advertisement is served, assuming a banner is served each time the page is accessed. Impressions are a metric used in web analytics.