The keywords you should be targeting depend on what theme your blog or website has.

Keywords are essential for any blogger wanting to get more readers, fans, subscribers, and ad revenue for their blogs. This is because keywords are search terms that people search on search engines like Google or Bing to find your blog. If you can get ranked highly for a keyword that is searched a lot on Google or Bing, you will get organic traffic to your site. Organic traffic is great because it is traffic through the search engines and it doesn’t cost you anything. The goal to build your blog is to find many keywords relating to your blog that people search a lot, and then rank in the top ten in the search engines for those keywords.
The keywords you should be targeting depend on what theme your blog or website has. The more specific your blog is the easier it will be to rank for keywords. SEOs generally base their keyword selection on more than one targeted group, and effective keyword analysis should take into account the competition for each keyword. The higher the advertising competition and payout per click, the more competitive a keyword usually is and the harder it is to be competitive for.

Why on the earth keyword should depends upon the theme of blog or website?
It should depend upon your business and niche


Blog is importaint for backlik and keyword is promote by blog.So keywords are importaint in blog.

Blog posting and comment is an important way to make back link to you website so that you need to get insert unique content and keyword in to your blog.......

Keyword means An index term, subject term, subject heading, or descriptor, in information retrieval, is a term that captures the essence of the topic of a document. Keyword plays an vital role in every business of internet marketing strategy...So keywords are very important mandatory resource of busines..

Keyworsd are important for every document which is on web because this is the thing by which a user can search your document. So same for blog you need to put all the targeted keywords in your blog and try to rank all.

keyword important in blog because keywords impove your website popularty, traffic& visitors, Goal & lead, Increase Page Rank and search engine position....

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