The following was published on Blueshift SEO. 

Maybe you’ve heard the acronym SEO and know it has something to do with helping your site reach more people — if that’s the case, then you already know more than a lot of people regarding what is SEO! SEO can get pretty complex when it comes to understanding all the factors that affect a site’s ranking, but the basic concept is not that difficult to understand. In general, SEO involves making changes to your website design and website contentto make it more attractive to a search engine so that your site appears higher on search engine results page.