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1. General seo information
1.1 History of search engines
In the early days of Internet development, its users were a privileged minority and the
amount of available information was relatively small. Access was mainly restricted to
employees of various universities and laboratories who used it to access scientific
information. In those days, the problem of finding information on the Internet was not
nearly as critical as it is now.
Site directories were one of the first methods used to facilitate access to information
resources on the network. Links to these resources were grouped by topic. Yahoo was the
first project of this kind opened in April 1994. As the number of sites in the Yahoo
directory inexorably increased, the developers of Yahoo made the directory searchable.
Of course, it was not a search engine in its true form because searching was limited to
those resources who’s listings were put into the directory. It did not actively seek out
resources and the concept of seo was yet to arrive.
Such link directories have been used extensively in the past, but nowadays they have
lost much of their popularity. The reason is simple – even modern directories with lots of
resources only provide information on a tiny fraction of the Internet. For example, the
largest directory on the network is currently DMOZ (or Open Directory Project). It
contains information on about five million resources. Compare this with the Google
search engine database containing more than eight billion documents.
The WebCrawler project started in 1994 and was the first full-featured search engine.
The Lycos and AltaVista search engines appeared in 1995 and for many years Alta Vista
was the major player in this field.
In 1997 Sergey Brin and Larry Page created Google as a research project at Stanford
University. Google is now the most popular search engine in the world.
Currently, there are three leading international search engines – Google, Yahoo and
MSN Search. They each have their own databases and search algorithms. Many other
search engines use results originating from these three major search engines and the same
seo expertise can be applied to all of them. For example, the AOL search engine
(search.aol.com) uses the Google database while AltaVista, Lycos and AllTheWeb all use
the Yahoo database.
 
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