A banner ad is an advertisement displayed on a webpage. The advertisement consists of an image(.jpg, .png, .gif) or of a multimedia object. Banner ads can be static or animated.
Banner ads are intended to generate traffic to a website by Linking to it. Also, web banners can function as regular, print advertisements inform, notify about a new product, increase brand awareness and so on. However banner ads are clickable and their main function is to deliver traffic to website.