Different Ecosystems for Advertisements
Google Ecosystem (Google)
Google Partner Websites (Display Network)
YouTube
Google Search (SERPs)
Partner Apps (Mobile Apps Network)
Google Discover
Meta Ecosystem (Meta Platforms)
LinkedIn Ecosystem
LinkedIn Ads
Amazon Ecosystem (Amazon)
Shopping Ads (Amazon Website & App)
Amazon Prime Video
Snapchat Ecosystem
Snapchat Ads
Simple idea: Each ecosystem is a group of platforms owned by one company where ads are shown.