Programmatic Advertising.

Programmatic advertising is the automated buying and selling of digital advertising inventory through software — demand-side platforms (DSPs), supply-side platforms (SSPs), and ad exchanges — using real-time bidding (RTB) and audience data to match ads to users at the individual impression level.

Real-Time Bidding

When a user loads a page that contains an ad slot, the publisher's SSP submits a bid request to connected DSPs in milliseconds. Each DSP evaluates whether the user matches the advertiser's audience criteria and what they'd pay for the impression. The winning bid is served in the time it takes the page to load — typically under 100 milliseconds.

Audience Data Types

Programmatic targeting uses first-party data (CRM uploads, site visitors), second-party data (data shared directly between a buyer and publisher), and third-party data (purchased from data brokers — Lotame, Bluekai, Acxiom). Third-party data quality is uneven and has been affected by Safari's ITP, Firefox's ETP, and eventual Chrome cookie deprecation.

Private Marketplace vs. Open Exchange

Open exchange (OEX) inventory is available to all buyers at market price — lower CPMs but brand safety risks and significant fraud exposure. Private marketplace (PMP) deals are invitation-only arrangements between a publisher and selected buyers, offering premium inventory with guaranteed placement quality and lower invalid traffic rates.