Definition of search engine

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search engine

The Search Engine” plays a vital role for our Internet work. The “Search Engine” refers to a Software System” which is setup to “Search” for “Internet Information” on the “World Wide Web (WWW)”. Usually, “Search Results” are accessible in a line of results often referred to “Search Engine Results Pages (SERPs)” in the “Internet”. The information may be a specialist in Information, Web Pages, Images and other types of Files in the “Internet”. So, you should know about the “Search Engine” for doing the “Internet” work in your Computer.




search engine

The “Google” launched in 1998 from a small “Search Engine Company” named “”. Around 2000, “Google’s Search Engine” rose to reputation. The “Google” achieved better results for many “Searches” with an improvement called “Page Rank”. It is known as “Google Page Rank”. “Google” analysis to a “Website” by using its “Search Engine”. This iterative “Algorithm” ranks “Website Pages” based on the “Number” and “Page Rank” of “Other Websites” and “Pages” that link there. Good or desirable “Website Pages” are linked to more than others. “Google” also maintained a simple interface to its “Search Engine”. In fact, Google Search Engine” became so popular within a short time to all over the World.

By 2000, “Yahoo!” was providing “Search Services” based on “Inktomi’s Search Engine”. “Yahoo!” acquired Inktomi in 2002 and Overture (which owned AlltheWeb and AltaVista) in 2003. “Yahoo!” switched to “Google’s Search Engine” until 2004. It launched its own “Search Engine” based on the combined technologies of its acquisitions.

Microsoft’s re-branded “Search Engine Bing” launched on June 1, 2009. On July 29, 2009, “Yahoo!” and “Microsoft Company” finalized a deal wherein “Yahoo! Search” would be powered by “Microsoft Bing Technology”.

“Microsoft Company” first launched “Search Engine MSN Search” in 1998 using “Search Results” from “Inktomi”. In 1999 the “MSN Search” began to display listings from look smart, blended with results from “Inktomi”. In 1999, “MSN Search” used results from “AltaVista” were instead. In 2004, “Microsoft Company” began a transition to its own “Search Technology” which powered by its own Web Crawler (Known as “msnbot”). founded in 1996. Usually, “Natural Language Queries” allows the “Internet User” to “Type a Question” in the same form where one would ask it to a human.


For example-

“Baidu, Inc.” established on January 18, 2000. It is a “Chinese Website Services Company” headquartered in the “Baidu Campus” in “Haidian District” in “Beijing”. “Baidu” offers many services including a “Chinese Language Search Engine for Websites, Audio Files, Images etc. “Baidu” was established in 2000 by “Robin Li” and “Eric Xu”. Both of the co-founders are “Chinese Nationals” who studied and worked overseas before returning to “China”.


Features of search engine


a) Using Software System

The “Search Engine” refers to a “Software System” which is setup to “Search” for “Internet Information” on the “World Wide Web (WWW)”.

b) Search engine results pages (SERPs)

Usually, “Search Results” are accessible in a line of results often referred to “Search Engine Results Pages (SERPs)” in the “Internet”.

c) Types of search engine result

The information may be a specialist in “Information, Web Pages, Images and other types of Files” in the “Internet”.

d) Available data in Databases

Sometimes, “Search Engine’s Mine Data” are also available in “Databases” or “Open Directories”.

e) Boolean operators to specify search query

Most “Search Engines” support the use of the “Boolean” operators “AND, OR and NOT” to further specify the “Search Query”. “Boolean” operators are for literal searches that allow the “Internet User” to refine and extend the terms of the “Search”. The “Search Engine” looks for the “Words” or “Phrases” exactly as entered by the “Internet User”.

f) Advanced Search option

Sometimes, “Search Engines” provide an advanced facility called “Proximity Search”. It allows “Internet Users” to define the distance between “Keywords”. The concept based searching where the research involves using “Statistical Analysis” on “Website Pages” containing the “Words” or “Phrases” which you “Search” for.

g) Relevance of result set

The effectiveness of a “Search Engine” depends on the “Relevance” of the “Result Set” it gives back. There may be Billions of “Website Pages” that include a particular “Word” or “Phrase” where some “Website Pages” may be more relevant, popular or reliable than others. Most “Search Engines” use methods to “Rank” the results to provide the “Greatest Results” first. How a “Search Engine” decides which “Website Pages” are the best matches and what categorize the results should be revealed in. It varies widely from one “Search Engine” to another “Search Engine”.

h) Search engine methods

The “Search Engine Methods” also change any time as “Internet” usage changes and new techniques develop for “Search Engine”. There are two main types of “Search Engine” that have developed. The first one is a system of predefined and hierarchically ordered keywords that humans have programmed extensively. The other one is a system that generates an “inverted index” by analyzing “Website Texts” it locates.

i) Search related ads

Most “Web Search Engines” are “Commercial Ventures” supported by “Advertising Revenue”. Some of them allow “Advertisers” to have their listings “Ranked Higher” in “Search Results” for a “Fee”. Usually, “Search Engines” that do not accept money for their “Search Results” make money by running “Search Related Ads” beside the regular “Search Engine Results”. The “Search Engines” make money every time someone “Clicks” on one of these “Search Related Ads”.

j) Search engine competition

Usually, most of “Search Engines” appear and compete for getting popularity.


For example- “Search Engines” such as “Google, Yahoo, Bing, Magellan, Excite, Infoseek, Inktomi, Northern Light, AltaVista etc.”



How search engines work


1. Web crawling

“Web Search Engines” work by storing information about many “Website Pages”. It retrieves from the “HTML Markup” of the “Website Pages”. These “Website Pages” are retrieved by a “Web Crawler” (an automated “Web crawler”) which follows every “Website Link” on the Website. The “Website Owner” can exclude specific “Website Pages” by using “robots.txt File” from the “Website Server Cpanel (Control Panel)”. Its predecessors, it allowed users to “Search” for any word in any “Website Page” which has become the standard for all major “Search Engines”. It was also the first one broadly known by the public.

2. Indexing

The “Search Engine” then examines the “Contents” of each “Website Page” to determine how it should be “Indexed”. “Website Data” about “Website Page” are stored in an “Index Database” for use in later Queries. A query from an “Internet User” can be a “Single Word”. “Website Index” helps to find information relating to the query as quickly as possible for the “Internet User” from the “Search Engine”. Some “Search Engines” such as “” store all or part of the Source Page (known as a “Website Cache”) as well as information about the “Website Pages”. But, others “Search Engine” such as “AltaVista” store “Every Word” of “Every Page” they get from a “Website”. This “Cached Page” always holds the actual search text while it is the one that was really “Indexed”. When the “Website Content” of the “Current Website Page” has been updated and the “Search Terms” are no longer in it. Increased “Search Relevance” makes these “Website Cached Pages” very useful as they may contain “Website Data” that may no longer exist to another place.


For example- “Words” can be extracted from the “Titles, Website Page Content, Headings or Special Fields called Meta Tags etc.”


3. Searching

When an “Internet User” enters a query into a “Search Engine” by using “Keywords”, that time, the “Search Engine” examines its “Index” and provides a listing of best similar “Website Pages” according to its criteria with a “Short Summary” containing the “Document’s Title” and sometimes “Parts of the Text”. The “Index” is built from the information stored with the “Website Data” and the method by which the information is “Indexed”. From 2007, the “ Search Engine” has allowed one to “Search by Date” by clicking “Show Search Tools” in the left most column of the primary “Search Results Page” and then selecting the preferred “Date Range”. “Yahoo” was among the most popular ways for people to “Search Website Pages” of “Interest”. However, its “Search Function” operated on its “Website Directory” rather than its full text copies of “Website Pages”. “Information Seekers” could also “Browse” the “Website Directory” instead of doing a “Keyword” based “Search”.




1. Need “Computer User”

2. Need “Computer”

3. Need Computer Monitor to “Display” the “Search Engine”

4. Need to “Type” a specific “Words” or “Phrases” in the “Search Engine”.

5. Need a “Search Engine” to “Search” a specific “Website Page” and get important information from that “Website”

6. Need a “Page Rank” to a specific “Website Page” to understand the
quality of a specific “Website Page”.

7. Need to analyze the “Search Engine’s Quality” which is giving you the better “Search Results” after “Typing” a specific “Words” or “Phrases” in the “Search Engine”

8. Need to analyze the “Search Engine’s Results Quality” which is giving you the better “Search Results” after “Typing” a specific “Words” or “Phrases” in the “Search Engine”




1. You should use the best “Search Engine” such as “” or “” for getting the better “Search Results” from the “Search Engine”

2. You should “Type” a specific “Words” or “Phrases” correctly in the “Search Engine”

3. You should specify which types of Information do you need from the “Search Engine” to “Type” a specific “Words” or “Phrases” correctly in the “Search Engine”

4. After getting the “Search Engine’s Results”, you should check that, your desired information has come or not by using the “Search Engine”




1. You should be careful to “Type” a specific “Words” or “Phrases” correctly in the “Search Engine”. Because if you “Type” a specific “Words” or “Phrases” incorrect in the “Search Engine”, that time, you will get the wrong “Search Engine Result” from the “Search Engine”

2. Usually, best “Websites” has a better “Page Rank” in the “Search Engine”. So, you should consider the “Page Rank” of a “Website” which is given by the “Search Engine” when you are collecting any “Information” from a “Website”.


Operating System


windows xp logo windows 7 logo windows 8 logo

In this way, you can understand about Definition of Search Engine, History, Features of Search Engine, How search engines work, Requirements, Tips and Warnings to use “Search Engine” in your Computer.

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