According to seo a lot of different kinds of keywords can be used to attract customers and boost popularity among customers who might be out there looking for the products and services you offer. Long tail keywords are words which are more like phrases or a string of words, they are likely to have a more accurate search result on what the user might be looking for due to its specifications, hence having a higher conversion rate. Mid-Tail keywords are slightly shorter than long tail keywords as they might be only a string of a couple of words, making the result not as accurate due to which the volumes are only moderate. Short-tail keywords are mostly vague keywords making the outcome broad.