The Evolution and Revolution of Search Engines - By this time...
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By this time there are two different types of search engines, “author controlled” such as Altavista and Excite, in which results were ranked by keyword relevancy, and “editor controlled” such as Yahoo, in which humans manually placed websites into their index.
Then in late 1997 out of Stanford University was born the most popular and well-known search engine to date: GOOGLE Google has a different way of ranking its websites. It used a Pagerank system. Simply what they did was list websites higher in their results based on how many links were pointing to a particular site. Of course, the content on the page had to be relevant to the keyword typed into the search box. But basically, Google invented what you could call a system of voting. So a site with numerous backlinks or votes would rank higher. A backlink is just when someone else puts a link on their site that points to another outside site. Jump forward to today and Google has more than 80% of the websites on the internet in their index, which is pretty impressive.
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