Search engines are software systems that search the world wide web using keywords to find related documents and present search results on a search engine results page. They are important because it would be impossible to manually search the billions of web pages. Common search engines include Google, Yahoo, and Bing. Search engines work by having crawler programs that access and analyze webpages to add them to a search engine database where users can search for information. When a query is entered, the search engine checks its index for relevant matches and retrieves search results.

1. SEARCH ENGINE
presented by
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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’

5. 3.TYPES
 Crawler based search engines
 Directories
 Speciality search engines
 Hybrid search engines
 Meta search engines

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

13. Pen
pen NOT Paper
OR
Paper

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

17. Search components(cont..)
 1. Indexing :
 2.Searching:
depending on user request it gives
response.

18. 9.HOW SEARCH ENGINE
WORKS

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.

24. 13.REFERENCES
 www.slideshare.com
 www.infotoday.com
 www.outoftheblue.com
 www.knowmyipaddress.com