Monday, April 2, 2012

Internet search engine?

A: What's an Internet search engine?

One way of finding information on the Internet is to use a "search engine". This is an Internet tool which will search for Internet sites containing the words that you designate as a search term. It provides results back to you in the form of links to those sites which have the term(s) you're looking for.

For example, if you wanted to see if there were any math lesson plans on the Internet that you could borrow, you might enter "math and lessons and plans" as your search term. After a brief wait, you would receive a web page with dozens of links to sites which had those particular words somewhere in the site.

It's important to understand that search engines DO NOT search the Internet itself. They DO search databases of information ABOUT the Internet which the company hosting the search engine has developed.

Each search engine looks through a different database and that's why they each will reach different results from exactly the same terms.

The degree of detail recorded by search engines varies greatly. For instance, some may enter the entire text of the document into a searchable field and others may only enter a short description.

This is only one way in which search engines differ. Another difference is in the level of sophistication employed by the search engine when it looks through its database.

B: How does a search engine know about the millions of documents on the Internet?

Search engines do not search the Internet itself, but instead search a database of information about the Internet. Thus, when a document is placed on the Internet, it will only be found by a search engine if information about that document has been recorded in the search engine's database. There are at least two ways a search engine finds out about a document. One way is for the publisher of the document to register it with the engine. If a document publisher wants to ensure that a document is "found" by search engines, then the publisher will usually register with as many engines as possible. The second way that documents get registered is if the search engine company finds it as part of its research routines. Some search engines use "spiders" or search robots to search the Internet and gather information which is subsequently recorded in the engine's database.

C: Why do I need a search engine?

For the same reason you need a card catalogue in a library. There is lots of great and useful information in a library, but it's physically impossible to examine all the books personally. Not even the most indefatigable web-surfer could hyperlink to all the documents in the aptly named World Wide Web. There are billions of pages on the Web. And every minute of the day, folks are posting more. The search engines and directories help you sift through all those 1's and 0's to find the specific information you need.

D: How does search engines listing work?

Search Engines responded to our site listing by developing more complex ranking algorithm. This is to ensure more quality results show on Search Engines Results pages.
Search Engines Rank a site base on the following factors :-
  • Age of site
  • Length of time domain has been registered
  • Age of content
  • Regularity with which new content is added
  • Age of link and reputation of linking site
  • Negative scoring for on-site factors
  • Uniqueness of content
  • Related terms used in content
  • Google Pagerank (Only used in Google's algorithm)
  • External links, the anchor text in those external links and in the sites/pages containing those links
  • Hosting uptime
  • Broken outgoing links not rectified promptly Unsafe or illegal content
  • Actual click through rates observed by the search engines for listings displayed on their SERPs


Credit Author : Mr. Arthur Yap
Edited by : Ms. Suwaibah

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