If you’d like your ads to show on certain sites across the Internet, you can add these websites as:
The Correct Answer is: Placements
Explanation: You can use “placements” if you’d like your ads to be shown on certain sites across the Internet.
Locations on the Display Network where your ad can appear. Examples include relevant websites and apps that partner with Google to show ads.
Read more here: https://support.google.com/adwords/answer/53215