Programmatic digital refers to the automated process of buying, selling, and optimizing digital advertising space in real time using software and algorithms. This method involves using technology to facilitate the buying and placement of ads, eliminating the need for manual negotiation and transactions between advertisers and publishers.

Programmatic digital advertising involves several key components:

1. Real-Time Bidding (RTB): This is a key element of programmatic advertising where ad impressions are bought and sold in real time through auctions. Advertisers bid on available ad space, and the highest bidder's ad is displayed to the user.
2. Data-driven Targeting: Programmatic advertising uses data and user insights to target specific audiences. Advertisers can use various data points such as demographics, behavior, location, and browsing history to show ads to relevant users.
3. Automation: The process is largely automated, which reduces manual intervention and streamlines the buying and selling process. Advertisers can set specific parameters and let algorithms optimize their campaigns.
4. Optimization: Programmatic advertising allows for real-time adjustments based on performance metrics. Advertisers can analyze data and make changes to their campaigns on the fly to maximize effectiveness.
5. Cross-Channel Campaigns: Programmatic advertising isn't limited to a single channel. It can span various platforms, including display, video, mobile, social media, and more.
6. Private Marketplaces (PMPs): PMPs are curated marketplaces where publishers offer premium ad inventory to a select group of advertisers. This provides more control over where ads are placed.

Overall, programmatic digital advertising offers efficiency, precision, and real-time control over ad campaigns. It enables advertisers to reach their target audiences effectively and optimize campaigns for better results.