Keyword optimization is the techique to analysis of the web page and choose the right keyword according to the web page.For example : A site relate to Seo keyword and you have to choose seo keyword most approiate word for that website........
You want to ensure that the keyword or keywords that are trying to get ranked in search engines are really the content of the page. However, I do not over do it. It's also good to ensure similar words for the same search term is found on the page as well.
Keyword optimization (also known as keyword research) is the act of researching, analyzing and selecting the best keywords to target to drive qualified traffic from search engines to your website. Keyword search optimization is a critical step in initial stages of search engine marketing, for both paid and organic search. If you do a bad job at selecting your target keywords, all your subsequent efforts will be in vain. So it’s vital to get keyword optimization right.