Search Engine Working
Web crawler, database and the search interface are the major component of a search engine that actually makes search engine to work. Search engines make use of
Boolean expression AND, OR, NOT to restrict and widen the results of a search. Following are the steps that are performed by the search engine:
The search engine looks for the keyword in the index for predefined database instead of going directly to the web to search for the keyword.
It then uses software to search for the information in the database. This software component is known as web crawler.
Once web crawler finds the pages, the search engine then shows the relevant web pages as a result. These retrieved web pages generally include title of page, size of text portion, first several sentences etc.
These search criteria may vary from one search engine to the other. The retrieved information is ranked according to various factors such as frequency of keywords, relevancy of information, links etc.
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