SEO refers to Search Engine Optimization, or the process of optimizing a website is the lot of public on the website can easily search it search engines like mozila.
So, putting these some concepts together: SEO concepts is any content created with the goal of attracting search engine traffic.
Keyword Research: If you want to traffic through search, it’s best to do keyword research before you start writing. This way, you can focus on keywords for which a certain amount of search elements already exists – in other words, write toward topics that people are already searching for information about.
Keyword Optimization: Know where and how to use keywords in your content for maximum searching power. (SEOMoz offers a great guide to on-page optimization.)
Content Organization: The content on your site should be organized in a logical way. This is not only good for SEO, but also helps visitors on your site find other related content easily. (The longer they stay on your site, the better.)
Content Promotion: Increase visibility of new content you create by sharing it on social networking site and building links to your content (both internally and from external sites).