SEO
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About search engines
I believe it is safe to say that search engines are the single most valuable source of free internet traffic. Search engines use your site as their content (well, not your website particularly but most sites on the world wide web) for people who are looking for something you have to offer.
As you remember, relevant traffic is what represents most value, so search engines develop what's called a search algorithms, which helps to determine how much a certain site (or rather individual page) is related to what a person was looking for.
The science or rather art of search engine optimization is to make sure that what your site has to offer is well represented in search engine results when people are looking for what your site has to offer. There are several main search engines. I will list them in the order of importance as perceived by myself – Google, Yahoo, MSN and then some regional/national search engines.