Hello. We got approved for google adsense a couple weeks ago. We will be posting products on our websites.There's no cost for this. They pay you per click, etc within 30 days after you've reached $100+. If you want to place your products with them, there is a cost for that -not sure what that is. Haven't implemented posting their products yet, but will be. We had already gotten an EIN, so were ahead on that one. You either give them the EIN or SSN for reporting payments to you.
you display googles ads on your website. someone visits your website and lets says cpc is $10. you would only get around $6 of that.
Googles main income source is Adwords. My personal income sources vary greatly depending on the niche/approach, I never use adsense though.
Mainly its Adsense / Adwords in combination with there own projects to gain user information (Youtube, Gmail, Android, Google (The search engine), Chrome, etc).
Advertising is Google's main source of income; AdSense and Adwords are just part of that the main earning source of Google.
Adsense is one of Google's advertising programs. Another one of Google's advertising programs is Adwords which is the source of the ads used for the Adsense program. Adwords users would pay money to run these ads so that they themselves can generate money by sending people to their websites. Website owners known as publishers can sign up with Google Adsense free of cost and get to place these ads on their websites. When an ad is clicked on, Google will pay the publisher about half of what the Adwords advertiser is paying to run the ad. Google gets the other half.
Adsense is the main source of income for Google. However, they also provide corporate solutions which is used by businesses/ organizations across the world.