What is seo

Search Engine Optimization for one. It's the process of trying to increase the traffic on a web site by making it more visible to the search engines.

SEO stands for search engine optimization which is the process of promoting a website in major search engines to get top ranking in major search engines. It can also increase the ranking as well as traffic of your website. SEO includes two activities, one is On-page and other is Off-page activity which follows the guidelines of search engines.

Here's a resource I've become a fan of lately:
http://www.seomoz.org/beginners-guide-to-seo

There are TONS of others. If you're looking for to increase the page rank of your own site, NEVER pay a company that says it will submit your site to search engines. That's was helpful back in the old days of the web. Today, it's an indication that either someone doesn't know what they're talking about, or they're trying to take your money.