2. 1.ABSTRACT
A web search engine is a software system that is designed to
search for information on world wide web.A search engine uses key
words to search for documents that relate to these key words .The
search results are generally presented in a line of results often
referred to as search engine result page.The information is in the
form of multimedia .Search engines are important because with over
many billion web pages available,it would be impossible to search
for information that is specifically needed.Search engines are used
to filter the information that is on internet and transform it into results
that each individual can easily access and use within the matter of
seconds.In present trend search engines are used by every human
for finding required information on web.Google is one of mostly used
search engine followed by yahoo and bing.
3. 2.INTRODUCTION
Search engine is a tool which helps in retriving
information from the internet.
Each search engine is a large data base which
utilizes different search techniques.
When a query or keyword is entered in search
box it checks its “index” with query.
Relevant matches are retrived as ‘search results’
6. 3.1.CRAWLER BASED SEARCH
ENGINES
Search engines that use software programs
are called “crawlers”, “spiders” .These
programs can access the webpages to
categorize and analyze them and then add
them in search engine database,where any
user can find them when searching
Examples: Google,Yahoo,Ask.com
7. 3.2.DIRECTORIES
Directories are websites sectioned in specific
categories by human editors and are then
placed in the “Directories” database.
Example
Yahoo Directory(www.yahoo.com)
8. 3.3.SPECIALITY SEARCH
ENGINE
They help the user to search in different areas
in specific types of lists that are specialized in
specific topic would be beneficial for narrowing
down the searching process.
Examples
Medhunt(provides only medical information)
9. 3.4.HYBRID SEARCH ENGINE
These are search engines that use both
crawler based searches and directory
searches to obtain their results.
Example
Yahoo.com
Google.com
10. 3.5.META SEARCH ENGINE
These are search engines that combine all the
results from other search engines into one big
list.
Example
Metacrawler
Dogpile
11. 4.HOW TO USE
Be specific
Use the + symbol and - symbol
Use Quotation marks
Combining symbols
12. 5.BOOLEAN SEARCH
Boolean searches use the “boolean operators”
to combine words and make the search topic
more specific and limited to the user.
Boolean Operators:
And
Not
OR
Near
14. 6.HOW DOES GOOGLE
WORK?
Google basically searches for websites that
contain the search topics.It will take every
word listed and then find websites containng
those words or group of words.
The technology behind google search is
“pegion rank”.
15. 7.HOW DOES YAHOO!
WORK?
Yahoo uses Yahoo! Search Technology
YST ranks webpages according to their
relevance to a particular query.
A search gives you immediate results from a
database that is updated daily to capture newly
created pages
Each time you search,YST scan through its
database of web pages
16. 8.SEARCH COMPONENT
Any search application has 2 major
components they are
1. Indexing component
2. Search component
21. 10.ADVANTAGES
Enable quick search to vast amount of
information from one search box
Search on specific type or piece of information
is possible
Different type of search engines enable to look
for specific type of documents.
22. 11.DISADVANTA
GES
Makes every one as dependent
Reduces thinking capacity of
individuals
Unrelated information in some web
sites.
Limitation:
Cannot index sites governed by passwords.
23. 12.CONCLUSION
So, I conclude by saying that with the use of
search engines any individual can access the
information which they need.And also search
engine provides quicker access.
Search engines now a days are playing vital
role in our lifes.