Search engines allow users to enter keywords to search large databases of web pages. They work by crawling the web to index pages, then ranking pages so the most relevant results appear first. Using techniques like wildcards and Boolean operators can improve search results. While search engines provide vast indexes and variety, they have disadvantages like not searching all pages in real-time or the deep web. The goal of search engines remains to provide high-quality, relevant results over the rapidly growing web.

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.