Online advertisements are promotional messages displayed on the internet to reach potential customers. They can appear on websites, social media platforms, and search engines, often tailored to users' interests based on their online behavior. Common formats include banner ads, video ads, and sponsored posts. These ads aim to drive traffic to a business's website or increase brand awareness. Advertisers use various tools and analytics to measure the effectiveness of their campaigns, adjusting strategies to improve engagement and conversion rates. Popular platforms for online advertising include Google, Facebook, and Instagram.