Short-tail key word is also termed as “head terms” that typically contains two key terms. These two or sometimes even three indicate the two key areas-one, industry in a broad sense; the other, niche or targeted segment. For example, “trainers “, “Oracle trainers”, or Digital Marketing”. The whole idea is to communicate to the visitors in the search engine and engage them to further search if the key words appear relevant and meaningful l to the site visitors.The advantage of employing short-tail key words
Source : http://www.edustudy.org/blogs/detail/difference-between-enterprise-seo-and-traditional-seo-69