Example of ad exchange and example of ad network: I have a website that I have space to run ads on, you have video or display ads that you want to show my audience. The duty of the ad network like google is to use an ad exchange platform like google ads to connect me and you.

Google ad is the ad exchange platform and google is the ad network. Facebook is the ad network, and Facebook ad is the ad exchange platform. There are many different ad networks and ad exchange platforms, but these two are the biggest ones.

Ad network vs ad server vs ad exchange: ad network is the company that serves ads like google and Facebook, ad exchange is the platform that people use to buy ad and sell ads like Facebook ads and google ads. Ad server is the technology that takes the ads and puts them in the appropriate places like a website, search engine result page, social media pages and other spaces that ads are placed.