This is the first post in SEO contest BLOG. So, I think explaining what is SEO should be in the place :) .
SEO - Search Engine Optimization - means to optimize website for Search Engines (Google, Yahoo, MSN ...) for high ranking in SERP (Search Engine Result Pages).
You have a website and you do SEO for your website for your keywords. When visitors search for your keywords and see your website on the first slots in SERP, you are the winner!
For easy understanding, this cuocthiSEO contest should be nice example. You go to Google and type CuocthiSEO and hit enter! If my blog is on the first place, Let say congratulation! I'm the winner :) .
Next question should be: how we optimize our website for getting on the first place of SERP? Be patient, I will try my best to explain to you later!
So, wish my best for the contest :D !