CONTENTS WHAT ARE SEARCH ENGINES? IMPORTANCE OF SEARCH ENGINES TYPES OF SEARCH ENGINES: – CRAWLER BASED – DIRECTORIES – HYBRID – META HOW TO USE SEARCH.

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Presentation transcript:

CONTENTS WHAT ARE SEARCH ENGINES? IMPORTANCE OF SEARCH ENGINES TYPES OF SEARCH ENGINES: – CRAWLER BASED – DIRECTORIES – HYBRID – META HOW TO USE SEARCH ENGINES EFFECTIVELY

WHAT ARE SEARCH ENGINES? A web search engine is a software system that is designed to search for information on the World Wide Web. It uses the keywords to search for documents that relate to these key words and then puts the result in order of relevance to the topic that was searched for.

SOME EXAMPLES OF SEARCH ENGINES

IMPORTANCE Search engines are important because with over 8 billion web pages available, it would be impossible to search for the information that is specifically needed. This is why search engines are used to filter the information that is on the internet and transform it into results that each individual can easily access and use within the matter of seconds

TYPES OF SEARCH ENGINES CRAWLER BASED DIRECTORIES HYBRID SEARCH ENGINES META SEARCH ENGINES

CRAWLER BASED SEARCH ENGINES These types of search engines use a "spider" or a "crawler" to search the Internet. The crawler digs through individual web pages, pulls out keywords and then adds the pages to the search engine's database. Google and Yahoo are examples of crawler search engines. Crawler-based search engines are good when you have a specific search topic.

GOOGLE Google was founded by Larry Page and Sergey Brin. The homepage of Google has a button labeled as “I’m feeling lucky ”. When a user types in a search and clicks on the button, the user is directly taken to the first search result. Google has various “special features” which include weather, unit conversion, currency conversion, time, calculator, maps etc.

Advanced Search

Yahoo! Yahoo was founded by David Filo and Jerry Yang Yahoo operates a portal that provides the latest news, entertainment, and sports information. The portal also gives users access to other Yahoo services like Yahoo Mail, Yahoo Maps, Yahoo Finance, Yahoo Groups and Yahoo Messenger.

DIRECTORIES Directories depend on human editors to create their listings or the database. Yahoo Directory, Open Directory and Look Smart are few examples. Human-powered directories are good when you are interested in a general topic of search

HYBRID SEARCH ENGINES Hybrid search engines are search engines that use both crawler based searches and directory searches to obtain their results. Example:- Yahoo.com- Google.com

META SEARCH ENGINES These transmit user-supplied keywords simultaneously to several individual search engines to actually carry out the search. Search results returned from all the search engines can be integrated, duplicates can be eliminated and additional features such as clustering by subjects within the search results can be implemented by meta-search engines. Example: Dogpile, Metacrawler

HOW TO USE SEARCH ENIGNES? A “+” before a word in a search will locate for documents which definitely contain the word. + A “-” before a word will exclude that word from search. - Placing words between quotation marks will search for phrase between the quotes. “ ” Using “or” between search phrase will search each term separately. or

Example: +BLACK+BLUE: The search results will contain documents which contain the word black and the word blue. BLACK-BLUE: Those documents will be returned which contain the word black but not the word blue. “BLACK BLUE”: Those documents will be returned which include the phrase black blue. (placed together). BLACK OR BLUE: Those documents will be returned which contain the term black or the term blue.