Search engine optimization as the name suggests is to optimize the web site as per the guidelines of a search engine so that the web site is visible on the net to users. Understanding about SEO is like taming those bulls that control the door ways to your site! It's just like a coffee lover going to a café house and thinking about having a coffee. The first thought would be to order a coffee (the primary keyword in terms of SEO).
The secondary options can be CaffÈ Latte, Espresso, CaffÈ Mocha etc. The bone of contention is to let the search engine know (just like the person taking the order) what kind of coffee is required. Keywords in a layman's language are the words to help the search engine to serve a user in the best fashioned way. The better a keyword defined (and of course the better a user types in a keyword) the better results are. Keywords density (that determines how the search engine identifies a particular keyword) has a major role to play in optimization. The limit of keywords varies according to the search engine. Every search engine has its own parameters that need to be met in terms of keywords, content, tags etc. Whether you are new or an existing website owner, whenever you are getting your site optimized, it is advisable to hire a company providing SEO expert services.
The density of keywords determines the fate of your website. Keywords and keyword phrases need to be used at the right time and right place. If you use the keywords in every odd line, you will end up getting your website banned with no future to it. This will result in loss of time and money. SEO expert services are easily available these days and that also at a reasonable fee so whether you have a big or a small website, you can get it on a search engine to attract the right customers. On any search engine, the keyword density ranges between anything between 3% -8%, any thing above that can end up your website on the bad books of a search engine. There are optimum keyword density tools like Optimum keyword density analyzer software which is very helpful when defining the targeted keywords or phrases.
Usage of the relevant keyword or keywords and the right SEO services is the key to success of any kind of website, irrespective of its size.