Search engine is a software program that
searches for sites based on the words that you
designate as search terms.
Search engines look through their own
databases of information in order to find what
it is that you are looking for.
“Search engine” is the popular term for an
Information Retrieval (IR) system.
Archie – First search tool for the Internet
Gopher – indexed plain text documents
Jughead – searched the files stored in Gopher
Wandex – first Web search engine
Larry Page and Sergin Brin at Stanford University gave it.
PA=(1-d)+d (PR(T1))/C (T1)+…+PR (Tn)/C (Tn)
PR(A): Page Rank of page A
PR(Ti): Page Rank of pages Ti which link to page A.
C(Ti): the no of outbound link on page Ti d: damping
factor in the range of 0<d<1,usually set to 0.85.
The highest the PR, the better the inbound link, so it would
Statistical similarity is used to estimate the relevance of
an query to answer.
Consider the query MAHENDRA SINGH DHONI
1) A good answer contains all three words,and more
frequently the better,we called this term frequency (TF).
2) Some query terms are are more important-have the
discriminatory power-better than others.
Resolving a Query
Consider ( cat hat mat )
Select a word from query ( “cat” )
Retrieve the list for the word cat
Find the best ranked document and look up the
Retrieve and Summarize the docs.
Search Engine Modules :
A document processor
A query processor
A search and matching function
A ranking capability
Summarizing and Presenting documents.
TYPES OF SEARCH ENGINE
Crawler-Based Search Engines
Hybrid Search Engines" Or Mixed Results
Google use spiders
Large index of keywords.
Google’s PAGE RANK .
1.frequency and location of keywords
within the Web page
2. Web page history.
3. number of other Web pages that link
to the page in question
It organizes the world ‘s information.
It makes the information universally accessible.
It makes the information useful.
Helps people to interact one another.
Helps to know about the products and goods.
Helps the people to know about the society.
Any information can be gathered from google.
Search engine plays important role in
accessing the content over the internet, it
fetches the pages requested by the user.
It made the internet and accessing the
information just a click away.
The need for better search engines only
The search engine sites are among the most