How Does Adsense works.....

When You put Adsense ads in your blogs/site a automated software robot named ‘mediapartners’ scans contents of your new page. This content is then passes through a algorithm which looks at things like:-

The textual content of your page.
Keyword Density (ie, what words and phrases appear regularly on your page)
What sites your page links to.
Your pages header, and keywords in the url.

Once that’s been done, adsense tries to work out what your page is, it aims to display the ads that will maximise your income by a combination of these two factors:-

1. Put ads that are relevant to the content of your page, and therefore likely to be clicked (called a high click through ratio, or CTR).
2.Presenting ads with the highest possible return per click (called effective Cost Per 1000 impressions, or eCPM).

How To Create Adsense Account

If You want earn money from google adsense all you need is a blog or your own website containing good keywords which can be found at goodkeywords.com and you can apply for a Adsense Account From Google.com/adsense