Search Engine Optimization is a process of choosing the most appropriate targeted keyword phrases related to your site and ensuring that this ranks your site highly in search engines so that when someone searches for specific phrases it returns your site on tops. It basically involves fine tuning the content of your site along with the HTML and Meta tags and also involves appropriate link building process.
The most popular search engines are Google, Yahoo, MSN Search, AOL and Ask Jeeves.
It is recommended to use keywords in page titles itself. This title tag is different from a Meta tag, but it's worth considering it in relation to them. Whatever text one places in the title tag (between the <title> and </title> portions) will appear in the title bar of browsers when they view the web page. Some browsers also append whatever you put in the title tag by adding their own name, as for example Microsoft's Internet Explorer or OPERA.
Keyword density is an indicator of the number of times the selected keyword appears in the web page. But mind you, keywords shouldn’t be over used, but should be just sufficient enough to appear at important places.
If you repeat your keywords with every other word on every line, then your site will probably be rejected as an artificial site or spam site.
Keyword density is always expressed as a percentage of the total word content on a given web page.
It is the search engines that finally bring your website to the notice of the prospective customers. When a topic is typed for search, nearly instantly, the search engine will sift through the millions of pages it has indexed about and present you with ones that match your topic. The searched matches are also ranked, so that the most relevant ones come first.
It is the search engines that finally bring your website to the notice of the prospective customers. Hence it is better to know how these search engines actually work and how they present information to the customer initiating a search.
There are basically two types of search engines. The first is by robots called crawlers or spiders.
Search Engines use spiders to index websites. When you submit your website pages to a search engine by completing their required submission page, the search engine spider will index your entire site.