Thursday, 5 July 2012

What is a Search Engine

Search Engines

Search Engines

Search engine is a website that provides the facility to find the required websites on a
particular topic. A user can search any topic on Internet using search engines. Internet
contains a lot of information. A large number of websites about different topics are available.
A user cannot remember all websites. He can search different websites using search engines.
Search engine contains the record of many websites. It searches the required websites and display them to the user. Search engines are very powerful tools for finding information.
Searching the Web

Different methods of searching the web are as follows:
1. Search using Boolean Logic
The Boolean operators are also used to search the required information from search
engines. All search engines do not provide the facility of using Boolean operators.
The Boolean operators are as follows:
AND operator is used to search on the basis of all words in the search string.such as “British AND Novels”. This search string will search for the websites ,that contain both words. The symbol + can also be used instead of AND.

OR operator is used to search on the basis of any word in the search string such as British OR Novels. This search string will search the websites that contain any of the two words. The symbol — can also be used instead of OR.

NOT operator is used to search on the basis of any word other than the search string
such as “New York NOT City”. This search string will search for the websites that contain the word “New York” but not “New York City”.

2. Search by Phrase:-
Keywords are used to search the required information from search engine. Keyword is a word or set of words that is related to the topic being searched. The keywrod is typed in double quotation if it consists of two or more words in the form of phrase. For example, the following phrases c be used to search information about Pakistani universities:
‘Pakistani thtiversities”
“Universities in Pakistan”

3. Search using Truncation
‘The truncation method is used to expand the seach to include a specified word root w different word endings. The first part of a keyword is given along with a symbol usually asterisk ‘ The following example will search Pakistan, Pakistani and Pákpattan etc