Kei

[jaysh4922]

KEI stand for Keyword Effectiveness Index, which measures how effective a keyword, is for your web site. It compares the number of search for a keyword with the number of search results to identify which keywords are the most effective for your campaign.

 

[sharmaroshni]

KEI (keyword effectiveness index) is one of the quickest ways to find keywords that show potential - that is, those keywords which are likely to help your site attract more traffic. It looks a bit like this: It's a scaled metric, so you'll never see a KEI of more than 100.
It is a frequently used term by Search Engine Optimization companies and stands for “keyword effectiveness index” or “keyword efficiency index”.