Search Engine helps in locating information on WWW. It refers to the database of internet resources of web pages, images etc.
By giving a keyword, user can find any information over internet. Then the engine searches for relevant information in its database and returns it to the user.
The three basic components of a search engine are below.
Known as spider or bots as it traverses the web to gather the information.
Database stores the information on the web consisting huge web resources.
Between user and the database, this component acts as an interface. User search through the database using this interface.
Below diagram depicts the Search engine architecture.
Indexing process contains the below three tasks:
Identification and storing documents for indexing is done.
Document is transformed into index terms or features.
The index created by transforming text is added to the data structures for fast searching.
Query process contains below three tasks:
Creation and refinement of user query and results display is supported.
Ranked list of documents are created by using query and indexes.
Evaluation is done offline and it monitors and measures the effectiveness and efficiency.
Below are the search engines available today:
|It was originally calledBackRub.It is the most popular search engine globally.|
|Bing||It was launched in 2009 byMicrosoft.It is the latest web-based search engine that also delivers Yahoo’s results.|
|Ask||It was launched in 1996 and was originally known asAsk Jeeves.It includes support for match, dictionary, and conversation question.|
|AltaVista||It was launched byDigital Equipment Corporationin 1995. Since 2003, it is powered by Yahoo technology.|
|AOL.Search||It is powered by Google.|
|LYCOS||It is top 5 internet portal and 13th largest online property according to Media Matrix.|
|Alexa||It is subsidiary of Amazon and used for providing website traffic information.|
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