Banner also called online banner, advertising banner or internet banner is the advertising space on an online advertising medium. A distinction can be made between static, animated and interactive banners.

HTML5 banners have now completely overtaken the Flash ads that dominated for years and are the latest standard in the animated/interactive ad banner space. Among the best known advertising banners are the so-called IAB standard formats of the Universal Ad Package (UAP) and consist of:

Medium Rectangle: 300×250, Wide Skyscraper: 160×600 and Leaderboard/Superbanner: 728×90