Online advertising refers to the practice of promoting products or services through the internet. This can include various formats such as display ads, social media promotions, and search engine marketing. Advertisers use platforms like Google and Facebook to reach specific audiences based on their interests and online behavior. The effectiveness of online advertising is often measured through metrics like clicks, impressions, and conversions. Advertisers can adjust their strategies in real-time, making it a flexible and data-driven approach. This method allows businesses of all sizes to connect with potential customers more efficiently than traditional advertising methods.