Real-Time Bidding (RTB) refers to a digital advertising technology that enables the buying and selling of ad impressions in real time. During an RTB auction, advertisers bid on individual ad impressions as they become available. This process occurs within milliseconds as a webpage loads, allowing advertisers to target specific audiences based on their behavior, demographics, and other data. The highest bidder wins the impression and their ad is displayed to the user. RTB optimizes the efficiency of ad placements, ensuring that ads are served to the most relevant audience at the best possible price.