A banner ad is a form of online advertising that typically appears at the top or bottom of a webpage. It is usually a rectangular graphic that promotes a product, service, or brand. These ads can be static images or animated graphics and often include a call-to-action, encouraging users to click on them for more information. Banner ads are commonly used by businesses to increase visibility and drive traffic to their websites. They can be displayed on various platforms, including social media and search engines, and are often targeted to specific audiences based on their interests and online behavior.