Keyword is a Word that search engine user might use to find relevant website.
Define key phrase.
• A search phrase made up of keywords called key phrase.
• Also Key phrase is a Combination of keywords.
Difference between Keyword and key phrase.
• Keyword is single keyword search query and keyword phrase is combination of keywords.
• Keyword phrase has less competition as compared to keyword and keyword helps for getting relevant traffic for your sites.
Define Keyword Density.
• Keyword density is a measure of the relative frequency of the word expressed in percentage