- Google reads the content of your webpage to create keywords.
- Advertisers bid on the keywords
- Appropriate ads are placed on the webpage.
- Webpage owner paid when ads are clicked.
If I was actually trying to make money off this blog I'd be upset, because no matter what I do Google is not serving me ads based on my content, keywords, blog categories, or meta tags. I've filtered my Adsense categories down to Video Games, Sexuality and Dating. Still I get ads for sandboxes.
My next step is to use the Competitive Ad Filter and list every toy site that I notice popping up.

