What is Search Engine?
Search engine is a mechanism or a group of programs that search documents for a specified keywords from the world wide web.
How search engine works?
Search engines perform some activities so that it can deliver search results. Some of them:
Crawling – Crawling is a method of fetching all the web pages connected to a web site. This task is performed by a package, known as a crawler or a spider (or Googlebot, just in case of Google).
Indexing– Indexing is a method of making index for all the fetched sites and keeping them into database from wherever it will later be retrieved.
Processing – Processing is a method of comparing search strings in the search request associated with the indexed pages and display the results.
Some popular search engines
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