How Search Engines Work - Lehigh University
How Search Engines Work
Today we show how a search engine works
? What happens when a searcher enters keywords ? What was performed well in advance ? Also explain (briefly) how paid results are chosen
If we have time, we will also talk about the size of the Web (If you really want to know how web search engines work, take my CSE345 WWW Search Engines course in the spring!)
Fall 2006 Davison/Lin
CSE 197/BIS 197: Search Engine Strategies 2-1
(Google results example)
PAID RESULTS
Fall 2006 Davison/Lin
ORGANIC RESULTS
CSE 197/BIS 197: Search Engine Strategies 2-2
Building an index
A search engine does not examine every page on the web when a user puts in a query
The engine first builds an index
? Custom database of all the words on all pages ? Search engine also stores other information
Fall 2006 Davison/Lin
CSE 197/BIS 197: Search Engine Strategies 2-3
Overview of organic search
Fall 2006 Davison/Lin
CSE 197/BIS 197: Search Engine Strategies 2-4
Matching the Search Query
The search query is everything that the user types to get results
? It is made up of one or more search terms, plus optional special characters
Analyzing the Query
? Expanding the query
Word variants: plural/singular, various verb forms Spelling correction
? Phrases, anti-phrases, and stop words ? Word order ? Search operators
Fall 2006 Davison/Lin
CSE 197/BIS 197: Search Engine Strategies 2-5
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