When referring to web advertising a banner, banner ad, or web banner is a type of image that first appeared on hotwired.com, after the first banner ad was sold to AT&T on October 27, 1994. Today, banner ads are found on one of the margins of a web page, most commonly top center that helps advertise another website or service and are what help keep a website supported. Below is an example of how a banner may look.
The above banner ad is an example of a horizontal ad that is 728 x 90 pixels advertisement. There are also button ads, vertical ads, and skyscraper ads of various sizes. Both vertical and skyscraper banners are taller ads that are in the left or right margin of a web page.