Almost anyone who has used the internet for the past three years or so would have stumbled upon the term SEO. Those with web sites would actually care what SEO means.
Anyway, if you want a simple indicator on how potent your web site is in the SEO department, then you might want to check out Web Site Grader. The ranking score and explanation is easy to understand and would not scare away those new to SEO.
In case you’re wondering; HTNet got a score of 89. Not bad, eh? 😉