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and advertisers to know how much are competitors are paying for the relevent keywords. Google keyword tool is an excellent service offered by Google for free. You can use it to find different keywords, that can potentially change your business. Google keyword tool is very important for smart decision making. Using Google keyword tool you cant forecast you ROI(Return On Investment) by comparing the cost against any expected income, by effectively putting quality adsense keywords on your sit, which will potentially increase you ROI.Google AdWords: Keyword Tool