CPA (Cost Per Action) – The cost paid per qualified action (click, sale, registration) from an online advertisement or affiliate link.
CPM (Cost Per thousand impressions) – An agreed upon price paid to a content site for displaying an advertiser’s banner a thousand times. “M” represents the...
SEO: Search engine optimization is a methodology of strategies, techniques and tactics used to increase the amount of visitors to a website by obtaining a high-ranking placement in the search results page of a search engine (SERP).
SMO: Social media optimization is the process of increasing the...
It is un-ethical black hat SEO technique. The programmer writes a content for search engine purpose, but not for the people. Consequently, the search engine sees one content, but visitor sees other content. It's violation of Google webmaster guidelines.