WebCEO’s Keyword Research tool helps you easily choose the most potent keywords which can result in maximum relevant user traffic. A keyword’s worth is determined by these metrics:
Monthly keyword searches. It shows how many times users search for a specific keyword per month – the higher the number, the more potential traffic the keyword can bring. This metric isn’t constant, so you should check it at least once per month and analyze how popular keywords are through various seasons.
KEI (Keyword Effectiveness Index). This metric measures a keyword’s ability to bring traffic based on its number of monthly searches and how competitive it is. A high KEI is better since it means the number of searches is high while the competition for the keyword is low.
Search trends. This metric shows the changes in a keyword’s monthly searches through the last 12 months, which can help you predict how effective (or not) the keyword may be in the future.