Impression

An impression is a fundamental metric in digital advertising, quantifying the display of an advertisement or piece of content to a user on a web page, application, or social media feed. It signifies that the ad has been loaded and rendered within the user's viewable area, or at least had the opportunity to be seen, regardless of whether the user actually noticed or interacted with it. This metric is the foundational unit for measuring potential audience exposure and is distinct from a "click," which implies direct engagement.