hi,
keyword optimization is a mix of both art and science where you select a specific set of keywords which you want your website to rank for in the search engines. if this is not done correctly then your website will not rank in the search engines which means no traffic to your website.

you can do a search in Google "Google Adwords Keyword Tool", it's a FREE tool that Google offers for users to do Keyword Research.

Hi, look at the reviews on many different keyword tools like keyword country, keyword discovery, wordtracker, semrush, keyword spy etc. Intersting articles are also available there.
The Best Keyword Research Software

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Zonkow,

keyword optimization is choosing a keyword to rank for and making it the pure focus of your website or articles like when you do seo on the keyword, like H1, H2, H3, keyword being in first sentence in first paragraph, and in the last sentence in the last paragraph

Keyword Optimization is a Process in which you have to Optimize a Keyword according to your Niche! Means You have To Select the Targeted keywords which are beneficial for your website!