How Does Google AdSense Work?

Ads on youtube are served through the google adsents platform, which is gogle's broader ad platform that they use for thefor the entire web. An advertiser can select kind of the sites or areas that they wantid to appear on. Ad delivery is a basically it says, ok, have this advertisement, and i have these targeting parimeters, and i'm going to figure out where is the best place to show this advertisement.