SEO or an extension of the (Search Engine Optimization) is a method or technique to create a website or blog in page / position one in the search engines (search engines) like Google, Bing, and Yahoo.
According to Danny Sullivan, search engine optimization or SEO is a term first used on July 26, 1997, by a spam message posted on Usenet. At that time the search engine algorithms are not too complex so easily manipulated.
The early versions of search algorithms based entirely on information provided by the webmaster via meta tags in the HTML code of their website. Meta tags provide information about the content contained on a web page with a set of keywords (keyword).
Most webmasters do manipulation by a keyword that does not correspond to the actual site content so that search engines seem to have misplaced and rank those sites. This causes the search results to be inaccurate and have caused losses for both search engines as well as for Internet users expect relevant and quality information.