A banner ad, or a web banner, is an advertisement displayed on a web page. The advertisement consists of an image (.jpg, .png, .gif) or of a multimedia object (usually created using Flash). Thus, banner ads can be static or animated, depending on the technology used to make them.
A web banner or banner ad is a form of advertising on the World Wide Web delivered by an ad server. This form of online advertising entails embedding an advertisement into a web page. It is intended to attract traffic to a website by linking to the website of the advertiser. In many cases, banners are delivered by a central ad server.