Top ad exchange in 2023:
1.  Google AdWords: This is an ad exchange operated by Google that allows businesses to place ads on Google's search results pages and other websites.
2. Facebook Ads: This is an ad exchange operated by Facebook that allows businesses to place ads on the Facebook platform and Instagram.
3. Amazon Advertising: This is an ad exchange operated by Amazon that allows businesses to place ads on Amazon's platform and on other websites.
4. Microsoft Advertising: This is an ad exchange operated by Microsoft that allows businesses to place ads on Bing search results pages and other websites.
5. The Trade Desk: This is a demand-side platform (DSP) that allows advertisers to place ads on a variety of websites and platforms through real-time bidding.