I got asked this question today, so I thought I would answer here for everyone.
The question was "What is the difference between Search Engine Optimization and Search Engine Submission?"
Search Engine Submission is simply informing the search engines (Google, Yahoo!, Bing, Ask, Jayde, etc) that your site exists and then they will "Crawl" your web site and begin to list the pages in it's database.
Search Engine Optimization is when your site's content, HTML structure, link popularity and other factors are reviewed and then adjusted accordingly to make sure you are popping up as high as possible under the various search terms someone would look your business up under.
Happy Webbing.
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