I have checked that Google Adwords would become like Media Company who sell the advertising in specific website not only their own search engine. I have posted this new in my website :
When Google serve an ad, they may place a cookie in your browser. A cookie is nothing but a text file, consisting of a series of random numbers and letters, but it does not identify you. The advertising cookies are
The Double Click Cookie on the Google content network
Conversion Tracking Cookie.