GOOGLE STARTED IT ALL
Google is the main search engine that started it all. It was through their AdWords campaigns that Internet marketers became more savvy about using the power of the advertising model to help shoot certain pages to the top of the search results pages. They noticed that the same keywords that online businesses were buying because their research showed many people were searching for them could be used to attract those same people to other sites. Soon, it became a standard SEO strategy to include keywords in content that was used to get pages ranked highly in Google’s search engine results pages (SERPs).