What is a search engine

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Search engines is a system that collects and collates information resources on the Internet, and it includes information collection, information collation and user inquiries. A search engine is a Web site that provides you with information "retrieval" services that use certain programs to classify all the information on the Internet to help people find the information they need in the vast sea.
The early search engine is to collect the address of the resource server in the Internet, and it is divided into different directories by the types of the resources provided by them, and then the classification is done on the same level. People want to find the information they want to go into their classification layer by layer, can finally reach the destination, find the information they want. This is actually the most primitive way to apply only when there is not much information on the Internet. As Internet information grows geometrically, there is a real search engine that knows the beginning of every page on the site, then searches all the hyperlinks on the Internet and puts all the words that represent hyperlinks into a database. This is the prototype of the search engine now.
With the advent of Yahoo!, search engine development has entered the Golden age, compared to its previous performance is superior. Now the search engine is not just a simple search of information on the web, they have become more integrated, finished landscaping. To search engine Authority Yahoo! As an example, from March 1995 by the Chinese-American Yang and other people founder Yahoo! began, to now, they from a single search engine development to now have E-commerce, news information Services, personal free e-mail services, such as a variety of network services, Fully explain the development of the search engine from a single to a comprehensive process.
However, because of the way the search engine works and the rapid development of the Internet, the results of its search are becoming more and more unsatisfactory. For example, searching for the word "computer" could have millions of pages of results. This is because the search engine through the relevance of the site to optimize the search results, this correlation is by the location of keywords in the site, the name of the site, labels and other formulas to determine. This is what makes search engine search results many and miscellaneous reasons. And the database of the search engine because of the development of the Internet also necessarily contains the dead link.
How to make the search engine accurate to provide people with relevant information should be the direction of its future development, rather than just comprehensive services.