search engines are programs or an information retrieval system which provide list of document available on www even without knowing the exact URL of the web recourse. With the help of Boolean operator we can get more exhaustive and specific documents and improve the recall and precision value of the results.
What is search engine?
Search engine is a program, database or an information retrieval system designed to help find stored information available on internet or on a computer it searches documents for specified keywords and returns a list of the documents where the keywords were found. Search engine are the key of finding specific information on the vast expanse of the World Wide Web. Without sophisticated search engines, it would be virtually impossible to locate anything on the Web without knowing a specific URL.
How these search engines work?
When a user enters a query into a search engine (typically by using key words), the engine examines its index and provides a listing of best-matching web pages according to its criteria, usually with a short summary containing the document's title and sometimes parts of the text figure see Figure-0.1
This is the simplest method of searching process of search engine:-
Figure-0.1
Ø Users put there query in interface (search box) of search engine.
Ø These queries come to the database from search program these giant database is the collection of information (web pages) which is indexed word by word.
Ø These database collect information from crawler/spider/robots (program which all the time fetch as many web documents as possible form internet) that visit a Web site, collect that web page (read the information), read the site's meta tages and also follow the links that the site connects to performing indexing on all linked Web sites as well. The crawler returns all that information back to a central depository, where the data is indexed. These crawlers will also periodically check changes happen in web sites (web pages) and send the information of latest change to its database
Ø Then these databases provides a listing of best-matching web pages according to its criteria, to result design(program which design result for display) which is concerned with which word should be capitalized, bold, hyperlinked etc. and provide a list of result usually with a short summary containing the document's title.
Ø After properly design the result, result design send the list of result again to interface.
There are some examples of web search engines – Google, Yahoo, MSN, etc. these search engines searches according to the given keyword by user. Most search engines support the use of the Boolean operators AND, OR and NOT to further specify the search query. Search engines search for all the keywords in a search phrase or one single keyword of a phrase it depends on the value of the Boolean operator used in the search term.
What is search engine?
Search engine is a program, database or an information retrieval system designed to help find stored information available on internet or on a computer it searches documents for specified keywords and returns a list of the documents where the keywords were found. Search engine are the key of finding specific information on the vast expanse of the World Wide Web. Without sophisticated search engines, it would be virtually impossible to locate anything on the Web without knowing a specific URL.
How these search engines work?
When a user enters a query into a search engine (typically by using key words), the engine examines its index and provides a listing of best-matching web pages according to its criteria, usually with a short summary containing the document's title and sometimes parts of the text figure see Figure-0.1
This is the simplest method of searching process of search engine:-
Figure-0.1
Ø Users put there query in interface (search box) of search engine.
Ø These queries come to the database from search program these giant database is the collection of information (web pages) which is indexed word by word.
Ø These database collect information from crawler/spider/robots (program which all the time fetch as many web documents as possible form internet) that visit a Web site, collect that web page (read the information), read the site's meta tages and also follow the links that the site connects to performing indexing on all linked Web sites as well. The crawler returns all that information back to a central depository, where the data is indexed. These crawlers will also periodically check changes happen in web sites (web pages) and send the information of latest change to its database
Ø Then these databases provides a listing of best-matching web pages according to its criteria, to result design(program which design result for display) which is concerned with which word should be capitalized, bold, hyperlinked etc. and provide a list of result usually with a short summary containing the document's title.
Ø After properly design the result, result design send the list of result again to interface.
There are some examples of web search engines – Google, Yahoo, MSN, etc. these search engines searches according to the given keyword by user. Most search engines support the use of the Boolean operators AND, OR and NOT to further specify the search query. Search engines search for all the keywords in a search phrase or one single keyword of a phrase it depends on the value of the Boolean operator used in the search term.
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