Definition of Long Tail of Search
The long tail of search refers to the vast number of lower traffic volume keywords that are often much less competitive (for SEO) than the most popular keywords. If you created a graph that shows the frequency of keywords on the vertical axis and the keywords ordered from most frequently used to least on the horizontal axis, you would find a very high but narrow peak for the common terms and a very, very long "tail" of numerous keywords that individually have few queries. The cumulative searches on these "long tail" terms can be a very large number. The long tail contains many simple variations and refinements of the general, short, and often somewhat ambiguous terms that have the highest volume.
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