2. P.KIRAN KUMAR REDDY S.SUMEGANA
11731A05A5 11731A05B1

3. TOPICS TO BE COVERED
 What is a search engine?
 Purpose of search engines?
 How search engine opererates?
 How we can improve use of search
engines?
 Advantages of search engines
 Disadvantages of search engines
 Conclusion

4. Search Engines
 Search engines are programes that
allow the user to enter keywords that
are used to search a database of web
page
Each search engine searches in a
different way and searches different
sites. That is why doing a search in
one search engine will produce
different results than doing the same

5. Purpose of search engines
 Helping people find what they are
looking for
 Starts with an “information need”
 Convert to a query
 Get results

6. How search engine operates?
 Crawling the web, following links to
find pages
 Indexing the pages to create an index
from word every place it occurs
 Ranking the pages so the best one
shows first
 Displaying the results that in a way
that is easy for the user to understand

8. How we can improve use of search
engines
 You can get better results from an
Internet search engine if you know
how to use:
 1. wildcards
 2. Boolean operators

9. Wild Cards
•A wild card is a special character which can
be appended to the root of a word so that you
can
•" Wildcards possible to search
search for all allow youendings to that root.
simultaneously for several words with the
same stem.
•Example: "educat*“, "smok*"

11. Boolean operators
1.AND
2.OR
3.NOT
AND
• Using the boolean operator “AND", it is possible to
narrow a search so that you get quite a limited set of
results.
OR
•The boolean operator “OR" has the opposite effect of
expanding a search.
NOT
•Another common operator is “NOT" which acts to limit a
search as well.

13. Advantages of search
s
The indexes of search engines are usually vast,
representing a significant proportions on the internet.
The large number of variety of search engines enriches
the internet, making it least appear to organiszed.
 The growing sophistication of search engine software
enables us to presicely describethe information that we
seek.

14. Disadvantages of search
engines
 They do not crawl on the web in the“realtime”.
 If a site is not linked it may not be accesible.
Not every page of a site is searchable.
Special tools are needed for the Invisible or
Deep web.
Few search engines search the full text of
web pages

15. Conclusion
The primary goal of search engine is to provide high
quality search results over a rapidly growing world
wide web.
Search tools like Google search engine employs a
number of techniques to improve search quality
including page rank, anchor text, and proximity
information.
As the technology advances at an unimaginable
pace, it is not unwise expecting an efficient search
engine, which addresses all the needs.