SEO stands for search engine optimization. It is the art and science of building Web sites that rank highly on searches conducted for specific keyword phrases. SEO is considered an "organic" form of SEM, because it does not involve spending money on advertising. A site without at least minimal SEO characterics built into its programming and content will be virtually invisible on the Web.
A method to increase a webpage’s performance in web search results. By tweaking elements on a webpage (there are on-page and off-page SEO factors), you can move a webpage up on a search result “page.” Marketers generally want to get their website page to appear on page 1 of a search results, ideally at the very top of the page. SEO elements include keywords, title and image tags, links, and more.