Online Advertising is a digital marketing strategy used to promote products, services, or brands through internet-based platforms. It includes various formats such as display ads, social media ads, search engine marketing (SEM), video ads, and influencer promotions. Online advertising allows precise audience targeting based on demographics, interests, and behavior, ensuring that messages reach the right people at the right time. With real-time analytics, businesses can measure performance, adjust campaigns, and optimize budgets for better results. Effective online advertising increases visibility, drives website traffic, and boosts sales by connecting brands directly with consumers in an engaging, measurable, and cost-efficient way.