There are a few places in your account where you may come across "limited ad serving" or "limited ads". Though they sound similar, these affect you differently: one limits the number of ads served on your sites or apps, whereas the other limits what data can be used to serve ads. This article describes the differences between these two terms.
Limited ad serving
Google may sometimes place a limit on the number of ads your account can show. This might be a temporary ad serving limit while we get to know you and evaluate your traffic quality, or it might be because we've identified invalid traffic concerns in your account.
You’ll be notified in the Policy center of your account if your ad serving has been limited. You’ll see an ad serving status of "limited ad serving".
Limited ads
Limited ads (LTD) allow you to serve ads in a limited way. Limited ads disable the collection, sharing, and use of personal data for personalization of ads. Learn more about limited ads.