What is keyword difficulty?
The keyword difficulty metric represents how easy or difficult it will be to rank on Google's organic search results for a specific keyword. It is based on different factors including page authority, domain authority, referring domains, and content quality.
The keyword difficulty score is on a logarithmic scale from 1-100 and it really differs between SEO tools. Moz, SEMrush, Ahrefs, and Google keyword planner all have their own version of a keyword difficulty checker.