Seo experts, a review of the topic
How much a site is relevant to a keyword depends on the density of that word in the web site. So if your web site has the phrase "affordable shoes" in it a number of times, when someone types "affordable shoes" into a search engine it is more likely that your web site will show up high on the results list for that search. The higher on a result list that your web site is, the more likely that it will be visited. This visibility is exactly what you need to make your product sell more or your idea to be spread. Though, buzzwords and keywords are not the only part of the equation when it comes to making your web site more succesful.