Keyword selection is vital for SEO (search engine optimization),

Lets understand what are keywords
Keywords  are single word like shoes, tshirts, mobile and so on and when keyword comes with secondary / supporting words it becomes keyprhases like cheap shoes, buy shoes online and so on.  Generally web surfers are tend to search for product / services in search engine using keyword or keyphrases. Search engine like google and other third party data operators like WordTracker and Compete keeps complete record of what is keyword trend (keywords/keyphrases) being search in all the major search engine and which keyword has highest competitiong and most conversion.

WordTracker also came up with a new strategy called High KEI keywords, this means those keywords which are likely to be search for but when ever they are search there is a good chances of coversion or in another words these keywords or niche keywords has higher conversion rates.

There are many way through which a webmaster could embed number of keywords to the website, some of them are through production description, company and client profile, news, blogs and forum and other content management tools whereby maxium keywords are used in the content using correct keyword density to acquire higher position in search engine and so the possibilities of conversions.