I would like to promote my site as best I can to drive more traffic to it, and so what is "seo" ? Also can I have two websites at one Web Host, or do I have to pay for another web host to put my second web page and domain into ?
su

seo is a topic that would take a lot more than a sentence or two to really describe, but I think a basic definition might be:

search engine optimization (seo) is the art and science of optimizing websites and web pages so they rank as high as possible in search engines.

The first book I read on the seo can be found at http://www.searchenginesbook.com/ which does a very good job at explaining the essentials. You can find plenty of articles at http://searchenginewatch.com/

The best way to learn about seo is to read, read, and keep reading, articles and forum posts. It's a subject that many experts disagree how to do best and something that as soon as you think you've figured out someone changes the rules of the game.

You can have two websites with the same web hosting company, but you will have to pay for two accounts to have both domains online. Each domain will need a separate account.

SEO is the way to increase the traffic to a site by high ranking in search engine result pages(SERPs). The probability increases to visit a site by users with higher ranking in SERPs. So site rank in a search is essential for directing more traffic toward the site. SEO ensure that a site is accessible to a search engine and improves the possibilities that the site will be found by the search engine.
I think you should also visit this thread to know more about SEO for beginners.
http://www.webmaster-talk.com/seo-ta...imization.html

SEO, in a basic term, is to optimize your website for search engine rankings through different ways, which can allow bots to crawl and index your site better, quicker, and more efficiently.