Below is the URL tag of the Example Document,
For well Optimized URL tag the selected Keyword for the Page is title tag OptimizationHow it's works
Here the chosen Keyword is same but the url is seoreporters.info/learn-seo/title-tag. This Example even though the two words are present but the tag doesn't optimize for the full Keyword.
This tool analyzes your URL tag for various Keywords and gives the report about how it's optimized for the particular Key phrase. Rather Using Key phrase is better than Keyword in the tag and also it's makes better chance in front of SERP in various keywords.
Latest modern Search Engines like Google using some synonyms terms that matched to our word so use synonyms of the Keyword in this tag.Updated on Sep 03, 2015