Introduction to the term search engine
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Search Engines
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Introduction
Search Engine refers to a huge database of internet resources such as web pages, newsgroups, programs, images etc. It helps to locate information on World Wide Web.
User can search for any information by passing query in form of keywords or phrase. It then searches for relevant information in its database and return to the user.
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Search Engine Components
Generally there are three basic components of a search engine as listed below:
Web Crawler
Database
Search Interfaces
Web crawler
It is also known as spider or bots. It is a software component that traverses the web to gather information.
Database
All the information on the web is stored in database. It consists of huge web resources.
Search Interfaces
This component is an interface between user and the database. It helps the user to search through the database.
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.
Answer:
Search engine is an application based or web based software which provides us internet surfing facilities. Example: Google Chrome, Mozilla Firefox, Opera Mini etc.