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Search engine optimization (SEO) is the process of affecting the visibility of a website or a web page in a web search engine’s unpaid results—often referred to as “natural”, “organic”, or “earned” results. In general, the earlier (or higher ranked on the search results page), and more frequently a site appears in the search results list, the more visitors it will receive from the search engine’s users; these visitors can then be converted into customers.
Search engine advertising (SEA) is a form of Internet marketing that involves the promotion of websites by increasing their visibility in search engine results pages (SERPs) through paid advertising.