Search Engines

• 1. Team members
  • Team name: BLUETOOTH

• Punch line: Information unplugged

• G.Vivekananda

• Gargi garai

• Jayalakshmi

• Joydeep Roy

• Keerthi Kalyan

2. Contents covered

• Definition of search engine

• History

• Popular forms of search engines

• How to build a query?

• How search engines work?

• • Querying

• • Ranking

• • Indexing

• • Natural language search

3. Search engines

• What is a

• search engine???

4. Definition

• Asearch engineis an information retrieval system designed to help find information stored on a computer system.

• Search engines help us to minimize the time required to find information

5. Why do we use search engines?

• With an estimated 800 million web pages finding the one you want is difficult!

• Allows a user to enter words which characterise a required page

• Time taken is less

6. Popular forms ofsearch engines

• Web search engine-Searches for information on the World Wide Web.

• Enterprise search engine-Search on

• (a) Intranets

• (b) Personal search engines

• (c) Mobile search engines.

7. How search engine works?

• Querying

• Ranking

• Indexing

• Natural language search

8. Querying

• Search engines provide an interface to a group of items that enables users to specify criteria about an item of interest and have the engine find the matching items within the group.

9. Ranking

• The equality between the desired item and the actual item must be exact.

• It is sometimes far more beneficial.

• Useful to incorporate a more measure of similarity between the desired item(s) and the items that exist in the group being searched.

10. Indexing

• A search engine will typically collect information, or metadata, about the group of items under consideration.

• The metadata collected about each item is typically stored on a computer in the form of an index.

11. Natural language search

• The term used to describe web search engines that apply natural language processing of some form.

• Traditional search engines tend to use a non-linguistic model of language.

• The results will be more accurate and efficient.

• Most popular language search is

• askjeeves.com

12. How to build a search

• The query can be simple or complex

• For complex queries, user can use the boolean operators like

• AND All the terms must appear

• OR At least one term must appear

• NOT Term following not must not appear

• Followed by One term followed by other

• Quotation mark Phrase must appear

13. Search engines

• Google is the most famous search engine

• The other search engines are:

• altavista

• yahoo!

• netscape

• msn

• AOL

• alexa, etc..

14. Uncertainty? Disbelief? Doubt??