Search Engine Optimization (SEO) is the practice of increasing the quantity and quality of traffic to your website through organic search engine results.
That's all the SE (search engine) of SEO.
The O part of SEO: it is where the people who write all that content and put it on their sites are gussying that content and those sites up so search engines will be able to understand what they're seeing, and the users who arrive via search will like what they see.
Optimization can take many forms. It's everything from making sure the title tags and Meta descriptions are both informative and the right length to pointing internal links at pages you're proud of.
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