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The Keyword Effectiveness Index (KEI) compares the Daily World Searches with the number of competing Web pages to pinpoint exactly which keywords are good enough so you can use them while optimizing your site. Keywords with the highest KEI combine attractive popularity and less competition. It means there are all chances you will get a high ranking, if you use these keywords for optimization. The KEI was developed by Sumantra Roy, one of the most respected search engine positioning specialists on the Internet, and author of the LinkExplore link popularity software. Click here to know more about this useful software.