Once you have the appropriate keywords to best describe your product  or service and are words that people are actually using, you now need to  create or modify your content to reflect these keywords.
Let's step back for a second and think about Google and the other  search engines. How do they actually know what your website is about? No  more and no less than by the "words" on the page. The search engines  are not humans; they cannot infer and deduce what your website when they  crawl your website. Thus the search engines know what your website is  about by the words you use in your content. Of course the search engines  have some intelligence and you can't get by with keyword stuffing, but  in very basic terms, this is how the search engines know what your  website is about.