SEO is Search Engine Optimization
Really basic explanation
At the top of every page you can set a series of key words, or tags, that describe the page
When search engines spider across your page, they are actively look at all the words that make up the page and then sorting out how to insert them into the search results.
With those words clearly defined in the top portion of the code, the spider can see them, grab them, and then stop searching everything else. Without those words the spiders will typically STOP searching really quickly and move on.
Ever notice how the bottom members listing on the site will show things like "Google", "Bing", "Yahoo", or sometimes "Bot"
Those are the spiders crawling across the page.
I am trying to make their life easier, so that we rate higher in Search Results, and then can therefore get more members, and keep the community growing