For well Optimized URL tag the selected Keyword for the Page is title tag Optimization
How it’s works
Checks for the Full Phrase Presence – If Present then the Page got some Score, Not Presence No score.
Checks for all the words Presence – If all present then the Page got full Score, partial presence low score.
Checks for all the words first starting position – How much in front that much it makes score.
Checks for all the words count – Its little complex algorithm to find keywords stuffing. Keep it as 1 for all words that’s better
Not Optimized Example
Here the chosen Keyword is same but the url is onpageseotool.com/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.