Difference between keyword & keyword phrase?

[webee]

Keyword and keyword phrase are the two main parts for any blog or article.
Keyword is just putting one word that needs to create better understanding and catchy to the readers.
Keyword phrases consist of adding more than one keyword that are written for making a context view understandable to the users.
But at times a keyword plays more powerful role than the keyword phrases as these single words matter the most that sometimes brings worth tracking and optimizing to the content.