For most major websites that publish external ads, a marketing team has to figure out the appropriate advertisers and rates, and the web designer has to find a way to incorporate the graphics, videos, text and
interactive content into the layout without letting it take over.
Google ads, on the other hand, are curated automatically and can be customized easily. They target your particular online demographic with the help of cookies that allow pull location information and search history from your visitors, as well as a Java code that generates context clues from the rest of the content on your website.
The pay you'll receive from Google AdSense will come from one of two methods of collection from advertisers: per-click and per-impression.
Some ads generate revenue every time another person opens that webpage and views the ad, but others don't pay off unless people actually click them. If the ads link to retail sites, you might even derive extra profits from clicks that led to purchases.
Google advertisers who already work with Google itself can opt out of being included in this service, but if they don't, they can submit sealed bids that determine the price of each ad.