Digital media buying is the strategic process of purchasing paid ad space across platforms like Meta (Facebook/Instagram), Google (Search, Display, YouTube), TikTok, Snapchat, Pinterest, DoorDash, Instacart, and LinkedIn to reach targeted audiences. It involves bidding for ad placements, optimizing campaigns for KPIs (clicks, conversions, sales), and leveraging audience data (demographics, interests, behavior) to maximize ROI. Each platform serves unique purposes—Meta and TikTok excel in brand awareness, Google dominates intent-driven search ads, LinkedIn targets professionals, while DoorDash/Instacart capture shoppers at the point of purchase.