Long tail keywords are used when the website wants to refine search terms to the web page, as well as when the searcher is looking for something rather specific.long tail keywords is relatively long, often is 2-3 word composition, even is the phrase, exist in the content page, in addition to the title of the page content, but also exists in the content.

A long-tail keyword is a keyword phrase that contains at least three words in the keyword pharse.

A long-tail keyword is a keyword phrase that contains at least three words (though some say two or more is considered long-tail). Long-tail keywords are used to target niche demographics rather than mass audiences. In other words, they're more specific and often less competitive than generic keyword terms.