Search engine optimization professionals research keywords in order to achieve better rankings in their desired keywords.
If a company decides to sell Online Video Marketing Services, the market is pretty competitive, and the Video Marketing SEO itself is Predominant.
In other words, using a keyword tool to help choose the best key phrase is recommended.
The tool gives statistics about the searches per month and the demographics of those searchers.
Choosing a key phrase with many searches, such as "Video Marketing," makes it more difficult to rank higher.
ARTICLE SOURCE: http://en.wikipedia.org/wiki/Keyword_research