WordPress is web software you can use to create a beautiful website or blog. We like to say that WordPress is both free and priceless at the same time.
SEO is an acronym for “search engine optimization” or “search engine optimizer.”
According to Wikipedia
Search engine optimization (SEO) is the process of improving the visibility of a website or a web page in search engines via the “natural” or un-paid (“organic” or “algorithmic”) search results.