SEO- search engine optimization. Its a way to improve the quality of your website in order to be founded on search engine quickly. The website that are on the first page when you are looking for something. well, those pages, do a lot of SEO, in order to stay on the first page on Google. You start by having good and enough information on your website, about what you are selling. Then, you start advertising your website, in order to have traffic, visitors. And you start submitting your website, on forums, blogs, write articles, press release. And that means SEO. This is the short version.
