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Google adwords is the advertising source that provided by Google. And it includes PPC like advertising form for given that the result to the site. You can find from Google if want the complete information and from Wikipedia.

In Google Ad words,
You will able to know lot many thing that how you can improve your site with their tools
and many things...

Google AdWords is a service that lets you create and run ads for your business, quickly and simply. Run your ads on Google and advertising network, you'll only pay when people click your ads.

Google AdWords is a advertising product developed by Google. AdWords permit pay-per-click advertising, cost-per-thousand advertising, and site-targeted advertising for text, banner, and rich-media ads. The AdWords program includes local, national, and international distribution.