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Manipulating text on a webpage was an early form of SEO. The classic document-ranking technique involved viewing the text on a website and determining its value to a search query by using a set of so-called "On page" parameters. For reasons that will be made obvious, a simple, text-only information retrieval system produces poor search results. In the past, several text-only search engines relied upon on-page ranking factors. An algorithm is simply a set of instructions, usually mathematical, used to calculate a certain parameter and perform some type of data processing.
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