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As I know WordTracker uses meta search engine data.
I heard that the keywords it delivers may not be the
exact words people use to search.
Is this true?
If yes, what is the importance of focusing them?
Yahoo Google, etc, have crawled the web, created their own database, and then applied their own algorithm to rank pages. A meta search engine simply uses data and rankings from other search engines and displays those results.
To answer your other question, no KW tool is 100% accurate. Use a two or three tools and monitor your web logs to see what KW phrases are being searched for.