You’re Not Being Stalked (you actually kind of are), It’s Just Programmatic.

Remember that time you were looking at shoes on Amazon and then the next thing you know you’re scrolling on your Instagram feed and see an ad for those shoes? That is programmatic advertising. A key function of adtech is programmatic advertising, which is how advertisers are able to target ads to you using your data. They are able to use adtech to automate ad placements and bidding. This makes ad targeting more efficient and improves the effectiveness of campaigns. Businesses, both large and small, are turning to programmatic advertising to increase sales and brand awareness. Another advantage of programmatic is that it has the ability to integrate omnichannel advertising, which allows businesses to target ads to consumers through multiple media channels.

https://www.etftrends.com/disruptive-technology-channel/how-programmatic-advertising-is-making-brands-money-in-2020/