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When using Google’s Adwords keywords tool, you actually have two tool choices: the external Adwords keyword tool and the Adwords keyword tool. Basically these two are offered by Google and both are for free plus you don’t need to download any software to use it. Secondly, the former has limited options when it comes to keyword search results. Lastly, the latter gives you more information on your keyword search results but you need to have a Google Adwords account which is quick and easy to sign-up for.