Simply put, keyword competition is a metric that AdWords uses to show potential advertisers how much demand there is for a particular keyword.

This metric is often used by advertisers when performing keyword research. 

A "high" competition keyword would suggest many … Read more

Logic is really simple. High competition keyword meas this keyword is search most of the time. Medium competition keyword meas this keyword is search medium of time and low competition keyword meas this keyword is search only few number of times.