Banner ads are online advertisements displayed on web pages, typically in the form of rectangular graphics. They aim to attract visitors to click on them, leading to a specific website or landing page. These ads can be static images or animated graphics and are often placed at the top, bottom, or sides of a webpage. Advertisers use banner ads to promote products, services, or brand awareness. They can be targeted to specific audiences based on demographics, interests, or browsing behavior, making them a popular choice for digital marketing campaigns.