A long tail keyword is a phrase that is generally made from three to five words. Since these keywords are more specific than generic terms, they allow you to target niche demographics. With long tail keywords, you are able to attract more high-quality traffic to your website which is more likely to lead to conversions.
Long-tail keywords are keywords or keyphrases that are more specific – and usually longer – than more commonly used keywords. Long-tail keywords get less search traffic, but will usually have a higher conversion value, as they are more specific.