Wednesday, 20 September 2017

Searching Internet / WWW Using Search Engine

A web search engine is a tool designed to search for information on the world wide web. The search results are usually presented in a list and are commonly called hits. That information may consists of web pages, images, information and types of files. Example of search engine includes Google, Yahoo, Bin ext...

Components of Search Engine

The search engine components are 

User interface: The part that searches a database for information to match your query.
Evaluator: The function that assigns relevancy scores to the information retrieved.
Gatherer / Spider: The components that traverses the web, collecting information about pages.
Indexer: The function that categorize the data obtained by the gatherer.  

Search Engine Working

                             Web crawler ( Gatherer / Spider), Database and the search interface are the major components of a search engine that actually makes search engine to work. Search engines makes use of Boolean expressions AND, OR , NOT to restrict and widen the results of a search. Following are the steps that are performed by the search engine.

1. The search engine looks for the keyword in the index for predefined database instead of going directly to web to search for the keyword.

2. It then uses software to search for the information in the database. This software components is known as web crawler.

3. Once web crawler finds the pages, the search engine then shows the relevant web pages as a results. These retrieved web pages generally include title of pages, size of text portion, first several sentences etc..

4. User can click on any of the search results to open it.

In the next post we will discuss about different types of search engine like search directories, meta search engine and text base search engines ext...  Keep visiting and follows us on Facebook.  


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