Banners (can also be referred to as banner ads) are used in advertising web pages to link the advertisement to a certain web page to increase sales. Banner space is sold to other companies as well as used to induce website visitors to consider specific products within the site.
A central ad server is used for the delivery of the ads Every time a user clicks on a banner the advertiser will owe the content creator for the interest that the ad has gained. Each user that clicks on a banner brings a nominal fee, usually around ten cents, but they accrue over a set period of time where they are then paid out.
The function of the banner is the same as traditional advertisements but to the online market.