Getting listed in Google and the other popular search engines is one of the most effective ways of directing free, targeted traffic to your website.
Below you'll discover what the search engines look for when determining your page rank so you can optimize your pages for best results. This is often called SEO or search engine optimization.
To this day, the marjority of my traffic comes from the major search engines.
How Search Engines Determine Your Rank
Before you try to add your site to the search engines, you should understand what they look for when they decide how to rank your site. Just because you're listed doesn't mean you'll get traffic. You have to make sure your site is search engine ready.
The general rule of thumb is that most engines use a "formula" to determine keyword relevancy. The technical term is called an "algorithm", and each search engine has its own unique algorithm that it uses to rank pages.
Generally, this magic formula consists of your page title, overall body content and the number and quality of links pointing back to your site, how long people stay on your site, etc.
It's important to note that every engine is different. Some may look at inbound links (number of people linking to you), others may place more emphasis on your body content. These days, meta tag content is becoming less and less important.
In case you don't know, meta tags are hidden descriptors that appear at the beginning of your HTML code, inside your tag. They may be invisible to your visitor's eyes, but search engine spiders can read them.
They usually consist of a title, description, and keyword tag and they look something like this:
<title>Title of Your Site</title>
<meta name="description" content="Description of your site here.">
<meta name="keywords" content="keywords separated by commas">
Because of abuse, many search engines no longer use these tags to help rank pages, but you should still include them because they do use them to display information about your site.
For example, whatever is inside the tag is what the search engine will use as the title of your site in the search results.
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Source: 2 Create a Website