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AdSense use javascript to catch the keywords of current page to display relevant ads. But I was recently noticed that it will show ads related to my browsing history too. It seems that the javascript code can read my cookie (in general I mean, e.g. list of domains visited) to display relevant ads.
Is it practically possible to read cookies of a visitor?
No, it isn’t possible to do so directly due to the same origin policy. (If it were possible, then you could make a page that stole the session of anyone on any domain!)
However, many websites include code from ad providers (read Google) on their page — so that Google knows that you have visited website X because website X allows Google code to run when someone visits it. When you later visit website Y and it asks Google to display some ads on its behalf, what happens is no mystery.
Google knows all.